I was going to say all that Don already said...
To add to those ideas here is a link to the unistrut and trolley stuff.
http://www.eberliron.com/store/category/Unistrut_Trolley_Assemblies/1056.html
I think this would be better than barn door hardware in this case, and more compact.

For the hoist I'd want manual control for carefully positioning things, not electric or air.
Something along the lines of a 1/4 ton chain hoist would be about right. Might find one with a loop of chain to operate it.
http://www.harborfreight.com/1-4-quarter-ton-lever-chain-hoist-67144.html

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-