I think that RO2 would be ideal to turn into a 1945 Battle for Berlin mod, late war period obviously, with late war uniforms on the models of Wehrmacht and scope for Waffen ss models, the soviets didn't change much during the late war period. This would introduce a lot more variety in terms of weapons and vehicles into the game.
In fact I only came back from Berlin on Monday from a weekend city break with my wife. As a re-enactor I was amazed at how much of the buildings from the pre-war period still survive. I was visiting the Museum Insel, or island not far from Alexander Platz and all of the surviving buildings have bullet and shell shot holes all over them, the scars have been either pasted over with cement or else patched with small blocks of sand stone or granit, or just left in some cases.
Anyway, I have done some modding in the past mainly for Arma and Arma 2 so I would like to turn my modest skills to RO2 and give it a go. So, if anyone fancies joining me, let me know.