Rust Repair questions and alignment

[twoskies]

side to side are alot closer
will be welding cab corner outer floor, rocker, pillar ,door patches and front and rear cab and supports next weekend(drivers side, pass side will be later)

only question at this point is the supports, ive got all the welds drilled out but its still got some solid attachment to front floor, any suggestions, i think i can get to the rear one since ive got the cab corner cut out, i could always cut the floor around the supports and weld new metal in if needed

any extra pictures would help

Thanks for the help and pictures