When we were designing the house to be built, it was the only room I could design. The only thing I didnt do that I kind of regret was a floor drain. Actually had it in the plans but since the room is a "formal dining room" we thought about resale value later. Otherwise im real happy with how it came out. A little specs on the room. It is 12x12, with 2 1/2 interior walls. The 380 wall faces the game/kids play room, and the 180 wall faces the living room, A door from the kitchen, and an exterior wall with two windows to put a small a/c in. 10 foot ceiling, vinyl floor, and 6 dedicated 20 amp circuits. Since I didnt have the tanks yet when we were designing everything, I just had them make an opening all the way to the floor. I enclosed it completly when we got the tanks. The metal stands I made myself and they are 52" tall by the time you add the 3/4" plywood and foam on top. I wanted them tall so when a 6' foot person is standing there they are looking at the center of the tank. Originally I was going to weld a catwalk across the back of the stands but decided to save room and use ladders. Ill do more on the build later.
Yes, unions are everywhere. I tell everyone that comes over if I ever sell the stuff, the tank will be free, but all the plumbing will be 10,000. PLumbing stuff was by far the most exspensive stuff on the build.