Heres the last big hole in the floor, all cut out:
Had to cut out the plate for the seatbelt spool, due to rust underneath
...and all welded up!
This actually might be the last hole to fix! Tomorrow im gonna pull it outside so i can go over the floor with wire wheels, flap discs, etc, cleaning up all the surface rust. Hopefully i dont find anything else that needs to be cut out.