If possible - list the parts you think it needs and the price you can get them at. Specifically:
Replacement PS doors, including glass & hdware
Also, if you could drop the tailgate and take a photo along the passenger-side bedrail to show if the box is straight or not (meaning the box either needs only a re-skin, or replaced entirely).
FWIW, if the frame is bent from that impact, it should be easily fixable. This looks to be a decent truck that would do somebody well if they were looking for a truck to drive into the ground. $4500 is an amazing price. For $6000, you could have a truck to drive for another 150k-200k miles.
(but STILL a G-darned shortbox :banghead: )