1967 Cuda FB project

I wanted to put in a hoop just for shoulder belt mounts if nothing else, but never came up with a good idea to get one in without cutting up more stuff. The main problem is that a proper hoop requires some kind of front to back bracing to keep it from folding over, but I don't want to cut holes in my rear deck for tubes or have bars running down my doors. The back seat isn't used often, but I'd like it to stay available as it could see more use someday. Want debating a hoop with a bolt in shoulder harness bar to make that more manageable, but never have really gone anywhere with the idea.