Power Locks and Windows to manual?
 

Can this be done, I am able to get a replacement door and it has both power options. Can I convert this back to manual?

And will the older interior door panels work with a newer door?

I'm not sure on the door lock hardware but I bet it would be fairly easy. I've never done that. On the door panels the window crank shaft is the key. The shaft comes in different length and you need to make sure to get a door panel near that year. I think 73-76 are the same but in 77-87 they change to a longer shaft. I had a set of panels Big Red tried to use some 78 model panels on his 75 and the panels stuck out too far from the shaft.

Yup, mine is an 80 and the door im looking at is an 85. I have the panels and all for my truck, its just that the door skin on my truck is FUBAR'd

As long as you got the parts, it won't be a problem.