Dylwad

Well i have no experiance in anything not even designing airplanes on paper. Everything i'm doing i'm learning as i go but love every minute of it. I want to build rc plane but i don't even know how to fly. Their was this guy that was going to teach me how to fly this summer but i never was able to get in thouch with him. Oh well maybe next year. I was wondering how were you able to align the holes down the middle of the metal rail? How wide should i buy metal rails?ie how much should the metal stick out from the sides in order for the bearing to ride on them.