In a perfect room I would use Huge tanks and have them split up with dividers and have my water change set ups on a toilet flush system (or sump pump float valve) so you merely have to flip your float valve in the tanks and the water change would drain and refill on its on, And agree with the thankless water heater and central drain set up, The reason I would do this over a drip is cost of water. Just a little more effort in the water change set up but will use lots less water.
If it was in the basement I would use a floor boiler and use radiant heat that way the room is always perfect.
Agree with the durarock sheets every where you can and to make it ever more water proof I would use those vinyl sheets or tar paper rolls (like you do in home made ponds or roofs, boats for the winter) and heat seal the seam so the cycling would be 100% water proof and do the same with the walls, You could potential if the humidity was left to high have it rain in the room.
because of it being super water sealed you would need to do something of a air exchange or dehumidifier, I would look into doing a commercial condenser of some sort to extract the air but I would have the tanks set up with super sealed lids to prevent as much as you can.
My lighting would be set up on led's (timmer moon lights to help increase the breeding) with a control board at the entrance for each section, row or how ever i decided to split it up. To prevent cords of sort I might try and look out new technology that may have a power mat strip through out the walls that way to set up the lights you could use a conductor and touch it to a point on the strip even though the strip is 100% sealed behind the walls and don't have to make direct contact (some very high end places are starting to explore this technology). Not sure if were there yet and you could even do this yet but I would have to do more research to see how fare along we are on it... Or try and make the room 100% wireless powered some way or another, I wouldn't want to compromise the sealed room with outlet boxes or wires running around that are not pleasant to see.
But of course this would be money is not an issue lol... If only I hit the lotto
