You're making good progress on your contribution build.
The item in the red squared area is a fuel can. The field workshop may have affixed metal bracing to support this fuel can, this was not an installed production line item. Water could also be carried in these fuel cans but the can would have had a white cross painted across both sides of the can and this is missing in the photograph. However this can appears neatly painted in both a dark color and black? (the dark color appears to match the color of some items affixed to the rear of the turret - note the colors evenly divided down the center of the can. what this represents in terms of what may be in the can is unknown and not mentioned on any of the captions concerning this photograph. This can and the colors are almost always missed by modelers rendering this particular Tiger II.
You'll also note that a spare track link (sometimes a side fender) is wedged between both exhaust pipes. This practice of placing parts there was quite common and can be seen in many of the Tiger II photographs but no conclusive explanation has been found to date on any of the original documents concerning this practice by the German Tiger II tank crews. Many good guesses abound like; keeping the pipes from vibrating thus extending the life of the exhaust pipe and muffler gaskets?

Hope this answers your question Darren?
~ Eddy
