Engine?
Some sort of closed loop hydrogen peroxide turbine engine, replacing the V-12 Maybach HL 230 P30 engine used on earth. A closed loop engine will be used due to the immense storms that rages on Mars, preventing dust/ sand to get inside the system.

They will NOT wear any survival suits of any kind because the Mars temparature is around -63 Celcius which is not alot but leasons learned during the Great German Victory in Stalingrad has increased the sofistication in cold weather gear, so the tankers uniforms could theoreticaly could be used outside the tank.

Do not forget that the pressure on Mars will mean that some sort of protective suit will be necessary. Without this, when the hatch is opened to fire the MG42 the crew will pop and should a storm be raging the empty husks will be sand-blasted.

On a similar note, any exposed workings (the turret / hull joint, the wheels and suspension) will need much more protection from the elements.

And for last, I would use the Mouse or E100 tanks . They have bigger room inside and after the war on earth the tiger would be not up to date.

Your camo idea is duly noted.

Whit weather protection i've been leening towards some sort of heavy fabric "curtain" for the wheels. Just like on Tamiyas dessertised Challanger 2.

The "Hinterhalt" camo used by the germans by the end of the war should do the trick. The base should be red sand or something simillar. The two other color maybe redbrown and dust. The little spot which represented the leaves in ww2 should represent the stones on the earth, againts the UFO-s attacking from the air.
Maybe chocolate brown should do the trick on this one.

Yah fer shure I would use the primer red brown the factories used. Orrrr make some sort of red brown "ambush" scheme you know with varying shades of the color maybe a lil brown for good measure. Or you could do a white KT for the battles over the precious ice caps. But remember the dust on Mars will be 10 times worse due to the atmosphereic storms on the surface ( which by the way also have harsh lightning to boot) Oh I had an idea to make the bigger scopes out of the nachtjager scopes of course with modification. I cant wait to see what your KT will come out to.

Nice idea. You could also hang a heavy fabric curtain aroun the entire lower half of the vehicle. This would stop dust reaching both sides of the tracks and aid in disguising the silhouette. A further idea would be to hang a turret skirt to cover the turret / hull join and further mask the shape.

Features might have to be designed to either be dust protected or to recess into the main hull in case of harsh storms. The front MG ball mount may be better replaced with a smaller mount in a deep circular opening which could be easily covered. The main gun could feature a shroud (like a jet engine thrust reverser. See below.) that could be operated from within the fighting compartment. It might also be a good idea to cover the vision blocks during storms and rely on newly developed radar systems. This 'hull down' KT concept would have far fewer distinctive features but would be better suited to the environment.

I don't know about replacing the 88mm for a Gatlingun. Seems a bit to sci-fi for me.

The 8.8 cm KwK 43 L/71 main canon used on Earth will also be used on Mars. Due to the low gravity the 88mm canon will be able to fire at much, much longer ranges than on Earth and therefor some sort of upgraded sight/ aiming mechanism might be needed.

Well, that being so, you could shorten the barrel. That would make it somewhat more compact, easier to transport in a spacecraft.

Engine?
Some sort of closed loop hydrogen peroxide turbine engine, replacing the V-12 Maybach HL 230 P30 engine used on earth. A closed loop engine will be used due to the immense storms that rages on Mars, preventing dust/ sand to get inside the system.

Tracks?
I have been thinking about putting legs on it but whit weighing almost 70 metric tons, having legs on it will probably just make the legs bore down into the surface and get stuck. And wheels might not actually spread the massive weight on a big enough area to make it effective. So tracks might be the best choice?

Hull?
I'm thinking of a "smooth" looking King Tiger whitout any zimmerits ( Although the threath of Allied Mars troopers is still there, zimmerits would pick up to much dust/ sand on the hull) and no tools etc. clamped to the hull as on Earth due to the impossible task of making battlefield repairs in very low gravity, and sand storms. It would be quite pointless.

General inside ( oxygen, the crew compartment etc.)?
Heat for the crew compartment will come from a generator powered by the main turbine engine and so will the electricity.

Crew?
They will NOT wear any survival suits of any kind because the Mars temparature is around -63 Celcius which is not alot but leasons learned during the Great German Victory in Stalingrad has increased the sofistication in cold weather gear, so the tankers uniforms could theoreticaly could be used outside the tank. The uniforms will be composed of a heavy duty Dark Organge jacket whit White pants and the always used Oxymask can be unplugged from the main oxygen output in the tank to a small emergency canister which will alow the crew to excape a damaged vehicle.

Camoflage?
Despite from being dark orange/ red, i have no clue!?
But something to match the color of Mars

Wooow, i thought you could do bunny jumps on Mars as you could do on the moon. Or am i mixing it up , gravity and pressure?

Looking great.

May I suggest some form of locking mecanism for the hatch and rear door.

Dust, and, of course, a complete lack of oxygen. Remember, you need to bring your fuel AND your oxydizer. And, if you're closed loop, your waste products need to be collected and stored until return to base. With the recent discoveries of water on Mars you could go to an open loop system & vent the exhaust (water vapour) overboard to lessen the system weight, volume and complexity.

The force of gravity on Mars is approximately 1/3 Earth standard, so a 70 ton mass Tiger II would weigh only approximately 23 tons on Mars, about the same as a LAV III/Stryker. Wheels would be a very viable option for enhance mobility on road surfaces, but tracks would provide better off-road mobility for the same reasons they do here on Earth. Even though the gravitational forces are less on Mars, the structural capability of the soil is independent of gravity and would be pretty much the same as it is here on Earth. The hard packed soil of mars could support a 70 ton weight as well as Earth's soil could.

One benefit, though would be that such a massive suspension would _not_ be needed. You could go with narrower tracks, fewer road wheels and smaller mechanical components.

Well, heat could come from collecting the waste heat from the main engine, no need for a separate generator for that. Power, well a take-off from the main engine would supply main power, but an auxilliary souce might be needed for when the engine is turned off.

No, they definitely will need full pressure suits. The atmosphereic pressure on the Mars surface is approximately 1/100th of Earth standard. Their blood would boil if not in a suit.

I know this is a "what if" but I am providing a few facts about the Mars environment to stimulate some brainstorming that takes into account the local conditions and would thus make the resulting model feel more "real". For instance, the discussion about suspension skirts would be very effective to lessen visual signatures of moving vehicles.

No, i've decided that they will not wear any pressure suits.
But why on Earth wount they have any suits? Well, this is strictly from my personal point of view.
As the need for crews to actually go outside the tank on Mars will be very virtually non existant except for some kind of emergency. BUT as tank combat being as dangerous as it is the actual life expectancy of the crew are very low, just like in the later part of WW2.
Pressure and oxygen will be generated by on board pumps etc. Wearing heavy suits ( probably made out of lead or lead lineings to counter the radiation outside) inside the realtive cramped conditions of the tanks would be quite straining for the crew due to the sheer weight even in low gravity. And the tank will have speciall anti-radiation materials built into it. Why go outside and repair something when you have Berg-Tigers to tow you back to base ?
Maybe some sort of emergency suits could be needed to there's a subben complete failiure of the life support system. Likte those survival suits seamen have, but that will only work for a specified amount of time once exposed to the harsh conditions.
I'm leening towards those bright "foil-ish" looking suits + a helmet.

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BUT as tank combat being as dangerous as it is the actual life expectancy of the crew are very low, just like in the later part of WW2.

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Actually, AFV crews had relatively low casualty rates all through the war. Even at the end, infantry casualty rates were miles more than AFV crews. Holing a tank is easy, but most of the crew suually got out.

It's your tank, of course, but they really could have suits.

Wearing heavy suits ( probably made out of lead or lead lineings to counter the radiation outside) inside the realtive cramped conditions of the tanks would be quite straining for the crew due to the sheer weight even in low gravity.

Maybe some sort of emergency suits could be needed to there's a subben complete failiure of the life support system. Likte those survival suits seamen have, but that will only work for a specified amount of time once exposed to the harsh conditions.
I'm leaning towards those bright "foil-ish" looking suits + a helmet.

Hmm...

If the vehicle takes any shot that would penetrate the hull, even slightly, the crew will die unless they put on their emergency suits in time. If I was a member of the crew then I would have my suit on all of the time. Just in case.