Ola Ziggy
Well What you could do is thin the insides of the fenders by sanding it with a motortool and when it is thin enough make it a little warm with a hairdryer or if you are brave enough over a flame from a tea light or lighter and then bend it.
There is the option of scratchbuilding the fenders and things on the side from Aluminum oventray which are very easy to bend and damage.
To answer your question on the foliage added to the tank by ways of camouflage depends a bit what forest it is. If it is a pine forest like in the ardennes your best bet would be the plant called Asparagos Plumosa which looks like this:
You can find it in flowerstores where you also can buy stuff for flower arranging.
If the forest in question is not littered with pines then you could go for something I believe they call Seafoam. (it is called Zeeschuim in Dutch) It looks like this:
Why they call the plant Seafoam is a complete riddle for me since as far as I know the plant neither has anything to do with sea nor with foam. You probably could find this at the florist as well. and other wise the modelrailroad shop has it.
Another option I know of is from a guy in Holland that often uses a grasstype which is very common in Holland... and I am not talking about the grass you buy per gram. Here are some examples of how that looks
For leaves I think I would go with birchseeds. They look quite good as leaves in scale. Convince yourself:
You can buy the stuff in Modelrailroad shops or hobbyshops... several brands are selling the stuff. However if you are a bit patient and you have birchtrees in your neighbourhood then you can pick them yourself for free. I harvest my neighbours tree at the end of July start of august everytime I go outside smoking. Then the stuff is still on the tree and easier to grab. Makes great forest litter too. Make sure you nuke the hell out of it with the microwave since there is a sort of bug that loves to live on these seeds.
I hope this answers your questions a bit.
with friendly greetz
Robert Blokker