The main frame rails on a Ford of this vintage run under the door sills and follow the perimeter of the body so there are no inboard frame rails to tie a cage to through the floor as on later year cars. My question is, can I run 1-5/8 mild steel tubing from side to side, framerail to framerail, similar to a trans mount or shock mount, and then tie the cage to these "crossmembers"? I know that there is no way to attach the cage to the floor to support the cage as the stock floor does not have enough strength to support it but the problem arises from the fact that there is no part of the boxed perimeter frame under the car, it truly is a perimeter frame.