Thanks for the review, I have a particular weakness for cast hull Leopard 1s and you haven't helped to discourage me from forking over cash for one.
I am surprised though that you bought this after all the bull manure you got with your constantly-breaking Hooben Merkava.
You mentioned that you'd like the retain the turn signals and I think Tamiya and other manufacturers have you covered there with their lighting kits (p/n Tamiya 53909) that go between your receiver and the control board to provide lighting:
Do you know what's the 3D print material of the tank? I had some first generation 3D parts (probably PLA) that 5-7 years down the road, simply crumbled in my hands when I went to handle them.