This is just a gorgeous thread. Something amazing about a bunch of fancy amps sitting all nice on the shelves.
I started by just stacking them up like crazy. Then I went to wire shelves, where I intended to get plywood for the feet but then I ended up just getting some 14" depth garage style shelving - looks kind of like the bookshelves but I wanted no backs on purpose because at the time, I had every single amp with the power cables plugged in, zip tied neatly behind it. I still had to move the speaker cable to whatever I was playing, but the logic was that I could play whatever amp I wanted and all I had to do is move two cables (speaker and guitar) and I was good to go. It was great because I had a really small amount of space.
Here's the wire shelf setup:
I don't really have a good picture of the in-between shelves. Ended up re-using those in the garage (the picture above place I didn't have a garage, but my new place does).
At the moment though, I've switched to 24" deep and 60" wide industrial shelves, because the amp collection has gotten sufficiently out of hand, so I have the amps up on the shelves stacked two-deep. And when I want to play one, I physically pull it and set it on top of the speaker cabs on the other side of the room (usually have 4-6 amps on the cabs but which ones are "out" I rotate). I'm pretty pleased with this setup because it gives me the most amount of space in the middle of the room to walk around while I play and stuff.
This is the current setup:
I like this setup a lot better. At the moment though, the top rough is also double stacked and I have a few sitting in the middle of the floor haha. I bought a 3rd shelving unit just in case I ever expanded or broke a part - the problem with all of these shelving units, including the ones I bought right here, is that they get discontinued all the time it seems, and I can't find another matching one anymore.
The cabs are on the opposite side of the room with a small couch in between, so I can sit while I play, or stand and walk around. I'm very happy with this setup.