I have built a cabinet w/ the sliding doors like yours, but mine are full cabinet boxes w/ shelves (which is a big pain in the rear). Looks like you just hung a couple of cleats on the sheetrock and used the sheetrock for the back of the cabinet ?? How long did it take you to build those?
I knew this storage would be for light and bulky items, so I didn't put in any shelves. I used some simple L-brackets to hang the uprights from the roof joists, and bridged some of the joists with a length of 2x2 where I couldn't tie in directly. My walls and ceiling are covered in 3/8" plywood, which gives me a little more flexibility than sheetrock. But this was quick-and-dirty work.
Did you install any shelves in those sliding door cabinets ? If so, I presume you just nailed in shelf supports??
No shelves in these, but this past week I built some similar cabinets on the back wall of the garage. With these, I was able to hang steel supports down from the center beam of the garage, use a heavy duty L-bracket to connect to the wall studs, and then also (literally) rest the base piece on top of some heavy-duty steel cabinets that I put in underneath. I only have a quick snapshot of the new work (since it's not done), but you can see some 3/4-depth shelves about half way up in the space. I did the same type of sliding doors. (You can't beat easy and cheap, and sliding doors are both.)
G'day Jack
I've been watching your Garage set-up for a while now and I congradulate you for the commonsense approach to your garage arrangement, Damn good !
I love the benches, the Hammer cabinet, the welding bench..all is good. What is the unit above the porsche in the ceiling ? It's got pulleys so it lowers or tilts to some degree.
I got three used steel tables cheap about a year ago. One of them became my fold-down welding table, and the other two were useful for supporting the jig for the
wrought-iron fence I built for the front yard. I'm going to cut one of them up for scrap, but I just couldn't resist holding onto the other one as an additional work surface. I'm not at all thrilled with my storage solution for it, but until I improve it, that's a 200-pound table up there above the car. (

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In this picture you can also see the old rear wall cabinets, which I just tore out.
The table support system uses six heavy eye bolts that go into the roof joists. It's raised and lowered by a permanently-installed electric hoist. I've got a redundant set of eye bolts that support the table when it's not being raised or lowered. There would have to be multiple simultaneous failures for it to come down. But my future plans are to (at least) connect three joists together with a piece of steel for supporting the eye bolts, and to maybe add a third layer of failure protection. Another part of me wants to either cut up the table for scrap or come up with a different place to store it. Something makes me a little queasy about storing something heavy along a ceiling. After all, it can't fall when it's already on the ground.
As an aside, moving the 510-pound top piece for the steel bench was a picnic compared to moving those 760-pound steel cabinets you can see underneath the new wood cabinets. I'll probably do a separate post on what was involved, but those suckers were very reluctant dance partners.