My boy/writing partner constructed his own theater room in his basement last year. But the catch was, that he have some kind of control over it from his studio as well.
His employer gets contracts to build A/V rooms (which they're stringent about procedures/protocol) or setup conference rooms for A/V purposes with the u.s. government & private corporations (this kat def does his share of traveling all over too).
He tells me they have to build racks and all that, plus setup/program automated switches for lighting, projectors & certain devices that work together at the flip of a button.
Plus a lot of this he says is networked, so he likes the challenge from all sides.
MPC 4000
SSL Fusion
Roland JV1080
Ensoniq ASR10
Pioneer XDJ RX2
Korg Triton Rack
Kurzweil K2500RS
MiniMoog Voyager
Yamaha Montage 7
Yamaha Motif ES Rack
UA Apollo X8 Interface
Tascam DM4800/DA3000