Can this cab be saved?

[cochran63]

I saved what seems to be a pretty clean truck from being hauled across the scales. It is very solid with great cab corners and rocker panels, but the passenger door drops an inch when it is opened. The hinges are solid, but the post the door attaches to moves when the door is lifted.

What do you guys suggest? Fix it, or use the perfect bed and tailgate on my 69 4x4.