I havn't done the R34 yet(so excuse me if I have NO idea on what the parts are like!), I dont have any plans on getting it either, although I am considering to do a Mines version. Why are you stressed about the steering? its not going to be taking any corners! I think you should just deal with what happened. But about the back wheel, is the pin too big or too small to fit in the rotor on the brake? You could very carefully sand it down if it is too big, if its too small there should be a way to get it in, try superglueing it in. I hope you don't want it to have rotating wheels because at this point it doesn't sound like that could happen. What do you mean when you say the front wheels dont sit properly? are they loose, leaning in or leaning out? My stupid input is that superglue will fix everything