actually, the body part is pretty easy. Luckily the body I used worked perfectly for the mounting. all I did was instead of putting the back tab into the slot in the back of the chassis, I let the back of the body rest on top of the tab and used some non-drying putty to keep it in place. like I said, it does show degraded performance like this since when you hit a bumb, sometimes the body will slip and begin to rub agains the tire, but I am just about done with an axle extension mod that will allow the body to be put on regularly with the big tires. I will post pics of the back of the bit when I get them