Ive never seen a D.I.Y forum before so it sounds like a great idea and should make out a good community, I'm sure a D.I.Y forum would intrest many people.
Well it seems as if DIY would be the way to go.....
I would need some staff to help me out with it though... icant do graphics worth a shit, and im not really up to par on making a professiona looking "commercial" site/forum...... so i wouldnt really know where to start.
I actually had a site called diy-forum.com. I've since dropped the site and let the domain name expire. It was a subject that interested me as I am a do-it-yourselfer myself, but I didn't have the time to properly promote it. I'd definitely say go for it!