I can safely say the "white" supra is far rarer than the silver, I can still buy silver supra full body kits on eBay really cheap :P I managed to fit a micro T board into a gen 1 with a custom chassis but a mini T board is alot bigger but you will be able to use more powerful motor's
also, I'm not sure what he means by "Try to get a smaller servo or else you won't be able to turn slowly the bigger servos are too fast" the speed is not a problem, in fact, the faster the better * that's what she said* it's the size that might be a problem * that's what she said*
Cheers
Mike