Lots of work, not many pics.

I finished the welding from the top of the pan. I still have to mount the seat belt nut for this side and the nut to mount the rear outer seat. Then I can mount the bucket seat mount (using the outer mounts as a guide). I do need to de-rust that mount first though.
A bit of hammer and torch work gets all the seams nice and tight...
... so it can be welded all the way around from underneath too.
I made a backing plate for the seat belt nut.. should be stronger than it would have been.