I saw the first part of this thread and thought of these
and then thought about my inner fenders that were wasted from a fenderwell header setup. I took the entire things out and now have a floating shock mount. These "hoops" would take care of the shock mount, but do nothing for the bracing the inners afforded, even though they were made of lightweight sheetmetal. They sure did pop when I broke the last spotweld. Ill look forward to those exoskeleton looking under the fender braces, make 'em for a 65 too, eh?
I think the firewall to frame bars are called "J bars" in cage building lingo, EZ to put a tab/triangle on them for the shocks.