LOL Thanks guys!
The cage is just welded to the cab floor where the cab braces are.
Got the rear Ford King Ranch seats mounted yesterday, took most of the day..
Bought a 5x50" 3/16ths plate, drilled and welded bolts to it and welded it to the floor. Then made another plate for the front support braces which had to be shortened which restricted the distance the seats folded forward. But at least they still fold forward so I can access the amp and subs which should fit nicely.
Thanks for the comments! Here's some pics:
