So I have finished the build. Besides the rails, it has been built straight out of the box.
The fuel tanks on the rear deck have been smoothed off and attached. I had contemplated adding some soft stowage, a bucket and other bits such as pioneer tools.
But as that is the reason why the T34/85 build is still not finished, I decided to just leave it as is.
There is a lot of dust on it, it will be dusted before it goes for undercoating (when the weather improves).