I would include a state of the art kick butt maintenance fish room.
One with multiple sinks, storage, water testing area, and one sweet saltwater mixing station and a drain in the floor.
Wall mounted RO/DI unit.
Mixing station with multiple water holding vessels, all plumbed with pvc pipe and ball valves.
One vessel for storing RO/DI.
One vessel for mixed aged saltwater.
One vessel for mixing saltwater.
One vessel dedicated to RO/DI water auto top off system to display tank sump a few feet away.
All mixing storage vessels with individual mixing pumps and heaters.
Mixing pumps/aeration and transfer pump to my tank sump system and pump from sump back to waste/drain. Never lift a bucket.
Ideally - if you could incorporate your sump with a very large nitrate reducing algae refugium - both located in this "maintenance" area room - and do ALL of your wet work ( aside from in tank cleaning )from this dream room.
Kick butt monstor protein skimmer is desired.
200 -300 gallon tank would be sweet.
MH fixtures and air cooling system above tank with ductwork to vent hot air above tank to outside vent.
VHO/Icecap actinics.
Drilled tank with multiple overflows and return spraybars ALL hidden from view. The only thing you would see in this tank would be rock/inverts and fish. No pipes, no powerheads, nothing but a natural setting. Everything exiting under the tank - and plumming back to the maintenance room.
Access doors to get to all components, finished off in woodworked cabinets.
QT in fish room as well.
Drain in the floor of this fish room for ease of mopping up any leaks or spills.
Small freezer for frozen foods, and possibly a dedicated live food tank to raise pods and other live tasty morsels.
Tank set up with the sweetest live sandbed and tons of live rock.
Corals and fish of your choosing.
From any view of this dream tank - I would not want to see one single piece of maintenance equipment.
Beautiful reef tank.
Hidden efficient, user friendly maintenance area.