Should i repair my cab or replace it?

[ortega]

on the left side of my truck where the lower hinge is bolted it looks like it was warped or something. It has body filler there and is not flat, the hinge has shims behind it. I have not been able to get it straight to line up the body lines. could i have that area cut out and another one put in? Or should i find a new cab,the cab is in good condition apart from that. No rust
the area is right behind the lower hinge but on the left side.