Google threads from Evan(358banshee), SNT, and my buddy James (Domestic Beotch). In that order to boot. Evan did probably one of the coolest builds. It's a totally custom chromoly frame with an EFI 4mm motor. SNT showed what you can do by chopping the front right off and going with a total redesign with more modern geometry. Domestic Beotch and I did one where we wanted to see just how much better things could be with out a total redesign. The goal was to dissect the front end piece by piece and re assemble it all with narrowed center point and more rake. That is a total DIY that turned out pretty well given it's time frame and ZERO dollar budget.
Another inspiration would be to look at the bike Springer built for special blend. That thing was to long for my taste, but the front end was fucking tits!
Gulp..... Maybe see what's up with Thack's new frame. Sounds like he got someone to build his wet dream frame.
Last but not least, search for stuff like loco did with his hill bike. Chopped it off and had a site sponsor bend tube to his desired specs and assembled it him self. That was a pretty slick set up.
Think outside of the box. Hell, I can't seem to avoid the life vortex and I've given up on a custom chassis, but I've found many walsh and laeger 250r hybrid frames for cheaper then the banshee outlaw and protrax frames and there is considerable room if done right.