Welcome to the board! Do you have any experience with metal or fiberglass? Neither is a walk in the park, especially if you haven't work with them before. I'm not trying to avert you away from doing it yourself, but I would advise you to at least look into buying one from some of the fine artisans we have here on the board. I think it would save you some heartache and frustration, and even a little money too. If you're still set on trying it out, I would think you could use the bucket template found here http://www.thedentedhelmet.com/showthread.php?t=23195 and a thinner gauge sheet metal. Good luck!