Why do you need bracing? It's not like you took the body off a full frame. If your unibody didn't buckle while driving it, surely it will not buckle when on a rotiss. If your car is really solid you need no bracing. I had my vert on a rotiss for 2 years with zero flex. The body alone is very light and there isn't much leverage to buckle it while on the rotiss. If you have any structural work to do, then a brace is a must.