Check this thread out on spearboard too. This was his first build and the gun turned out really good! Also, the gun build extraviganza should be a good one to follow, from what it looks like, the Gits is a master craftsman.
First Speargun Build - Spearboard Spearfishing Community
If you do plan on building a gun, post your progress in the DIY section. There are many gun builders on this site who would be more than happy to give advice!
