I don't know what you will be doin this for, but it would be cool if you could get them on a piece that would flip up from underneath. I'll try to explain it better...
have your amp upside down not visible. When you push a button it flips out and you can see it. Ya get it? I'm havin a tough time explaining it cause its all in my head, ya know?
Another idea would be if you could do the same thing except have it pop out from the side. Like a airplane opens its under doors. They slide away and the amp comes out. I dunno. Just slap me...