In the photos it looks like neither of the doors close.
Are you sure the frame is not tweaked from the crash? That would partially explain why the door will not latch and get a good seal from the weather.
Hopefully if it is just the frame that has some undue torque in it now, the cab isnt permanently twisted as well, and would settle on a straight frame no problem.
to the board, and good luck on your build, it should be fun to see what you do with this!!