Wow, fitting all that in a small room like that... I strongly agree with the Humidity issue. You have windows in the room, maybe make some sort of ventilation fan that would direct airflow out. Humidifiers are nice, but pretty loud.
I also agree with Tom on have a bunch of pretty, nice display tanks in a small cramped room, it may look great initially but later on your eyes will be going from tank to tank and will take away the viewing pleasure. With other nice tanks in the room it will distract you from the one you want to look at. I'm very interested in seeing what a few hundred pounds of seiryu stone looks like.
Post more pics please!