put a dab of paint on the ends of the body posts. set the body down on to the posts where you want it to be. tyg. for the antenna you just need to be rairly close. the antenna tube will bend to the hole you put in. to make the holes you can sharpen a piece of tubeing and cut the budy that way or you can go to a hobby store and get a reamer like this. http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXJGU5&P=7
There is a company out there that makes body post holes. They are real sharp metal pieces that directly slide over the body post. Once you get the body lined up, you press down on them and they make a dimple in the body. Real nice tool to have.