this methoed works very well . use play dough on the bottom of the body were you think the body hole will go.spread the play dough across the body so it goes from one side to the other of the body.then line up the body with the body post makeing sure the body is stright then push the body on the post and it will leave a mark in the play dough then just drill out the marks and you have perfect body holes. to make the engine hole use the same methoed by putting the play dough on the cooling head and use a 2 inch hole saw it will be a perfect round hole that looks great