Slick Shadow you have there. Kudos to ya. Was thinking the full frame option as a last resort and the more I think about it, the more sense it makes as the Roller body and rear end flexes quite a bit when putting power through it.
I note you have gone with a live axle rear end instead of an independent set up. Is there room in the rear floor area to still have decent suspension travel and to accommodate movement of the diff housing?
I've also checked out the hydroboost option. Are you still running the floor mounted pedal box or rat trap or did you go for a firewall mounted set up?
Also interested in what front frame you are using to retain the same track as the Roller.