Good progress!
Not trying to spoil your fun, but I just realized that the tank is actually inside a closet / dressing room... have you thought about the humidity, and how you're going to control it?
FWIW, my 75g evaporates about 1.2 to 1.5 gallons per day... if yours is anything like mine, that's going to be a lot of humidity in a closed space, and it's particularly bad if you keep your clothes there... you'll also want to think about how to contain the salt spray from the sump... I know the inside of my tank stand (where the sump is) is covered with a thin film of salt, and there's no visible spraying/splashing.
Nuno