Would you want weld in connectors? I prefer weld in but I bet some type of setup could be made with bolt on stuff. Do you think bolting some onto the bottom of the rear trailing arm unibody frame and take that up along the pinch weld up to those pads that run along the side of the transmission mount would be enough or do you think they would have to run all the way to the front? WoW that was a really long sentence.
I guess they could run past that pad with a bolt on plate and up to that unibody gusset that runs from the rear lower control arm mount to the floor. I bet that would work. I bet I could fabricate something like that.
The toughest part would be that part where the rear floors dive way down. Maybe if the tubing was thinned out right there and flared inside then bolted to the rear floor under the carpet. That can't hurt. Maybe the best thing would be a combo weld/bolt kinda thing.