Ryan,
Could I fix it? Absolutely!! Would I fix it ?? NO!!
You can not weld rust!! For as many pit holes that I see, even MIG welding would be tough. Plates need to weld to something and will warp the original frame making the spindles to be out of level.
The original metal is thin to start with, so you just chase more holes as you weld. BTDT. I have attempted to fix a few decks in better shape and was not happy with the results.
But that is just my opinion,
George of Buford
Could I fix it? Absolutely!! Would I fix it ?? NO!!
You can not weld rust!! For as many pit holes that I see, even MIG welding would be tough. Plates need to weld to something and will warp the original frame making the spindles to be out of level.

But that is just my opinion,
George of Buford
