I've got a home built space frame myself. It's also LS powered but also supercharged. It's not for a Cobra but for a Ferrari GTO. I've got a build thread on another site:
C5 gto - All MetalShaping
I really like the engineering you've put into yours, especially the novel suspension stuff. I used C5 Corvette suspension, transaxle, etc. on mine. Now that I've said this, you can figure out where my user name comes from
Anyway, thumbs up on you work!