Go for it man. If you know he's good let him, but watch him do it just in case he wants to screw with you. Then you can smack him a couple good ones if he fucks around. Life isn't anything unless you take chances.
Have him help you make it into a snapback, then when people ask where the heck you got a jiberish snapback you can look them straight in the eye and say "i made it" 0_0