12x8x4
Thats 1.5 cords of
firewood.
You don't do anything small.
A few years ago I worked in a restaurant that had a heavy curtain in the center. On slow nights, the dance floor is shut down for intimate dining. For weekends, it is opened up for a gala evening. With the room divided, private parties were possible. The place could be expanded and contracted as needed, with the added benefit of good sound control. It looks like your shop room could function the same way. The shelves will dampen lots of sound. I don't think a curtain at the rafters would be needed.
I once built some rolling shelves for a lady to put in her closet. It was a deep closet, and she needed to get to the back, but had stuff in the way. The rolling shelves did the trick, but there were 3 issues.
1-Stability. Because the shelves moved, I had to keep the thing from twisting in 2 dimensions. Looks like you have a diagonal board on the shelf over on the right. Is there one on the back? A couple of diagonal cables can do the job. I once used the steel banding that came with a pallet of studs in lieu of cable.
2-Containment. To keep stuff from falling off, I put a small ledge across the front of the shelves. This had the added advantage of making the shelf more rigid-more weight without sagging in the middle
3-Those damned cats. I advised the nice lady to check the wheels for hair clogs and add a drop of oil every now and then.
Might I suggest one addition to your shelves:
Being they are of great size, and will likely hold a great volume of stuff, anchoring the shelves to the wall temporarily can add an aspect of safety. I'd hate to see one of these fall over
should the weight shift or a wheel give out. A couple of L-brackets strategically placed would give you plenty of grab.
Are the
lights hanging too low?