Beautiful system! So many shiny knobs, I'd be playing with those like a 5 year old for days
Just one thing I'd think about (and the amp design might accommodate this, so the point may be moot.) These giant amps generally put off allot of heat. You might not want to stack 'em all like that if you're going to be using them heavily. The top vents are especially crucial, and I personally try to keep at least 3" clearance above my amp.
Please somebody tell me off if I'm wrong, but I'd hate to see anything in that beautiful rig fry!