i think that as long as you know what you are doing, and have the correct IDEA of what you are doing... that you'll be ok :shrug you might want to go check out the build up of bronkzilla's cage (in the general chit chat section) and theres a LOT of input and pictures in there... :thumbup
So to conclude this thread...and add in that Mike (Gremlin) knows a lot about his engine and how to build them and can fabricate his own radius arms...I beleieve it would be safe to assume that that cage is going to work.
Ya thats mikes ride. The bar is professionally made, and I'm very sure it will work, I've seen it in person. And as for the being able to control the seats.. No you can't.. Some moron welded it in place. I felt like a 10 year old trying to drive it I couldn't reach the pedals Kick ass engine though even being worn out.