AC -- Restore, update or ditch it?

[Daubs]

My 72 K-20 has air-cab and what looks to be factory air. I purchased as-is and it's missing condencer (and maybe other parts). It's a mut truck (frame, running gear from 4x4, body from Camper Special 4x2).

Wondering what to do with my AC. Some options:

1. Fix existing system and take it back to original condition, or close to original. Could cost me some serious $$$. What about coolant issues?

2. Replace with aftermarket system. Might be less $$.

3. Take out all together. Possibly sell my parts(?).

Tell me what you think...here are some pics.