I would say if you are trying to go with the more metal looking ones that are really cool without actually making them, then go to Hobby Lobby. They have so many cool things that are already made that you can buy. Or you can buy the really easy kits and put them together yourself. Anyway after that, use fishing line to hang them from the ceiling. It's sturdy and virtually impossible to see. I'm sure Hobby Lobby has coupons like Michael's does, so just ask or look in the paper.
Have fun, it looks so neat for boys rooms. We did it for my son's room when he was little. Then we bought just some smaller planes, like where the Hot Wheels were in Target and put around as well. I didn't look to see how old your son was, so that might be a factor.