Are you going to be implementing a continuous water changing system. You could tap an RO/DI unit in and plum it and hookups for supply and drain inside the walls, along with independant electrical circuits. Not sayin that all the plumming would be inside the walls, just a few hookups to make setup and maintanance easier.
Also, I reccomend against the steel joyces, moisture will condense on them and damage the drywall, as well as contribute to heat loss in the winter.
Something else to consider - If you take out all the existing vapor-barier and insulation, frame the rooms with 2x4, 1/2 inch of the walls, you can install R-18 or hard foam between the joyces and gain a good bit of square footage.
A friend of mine is a Class A contractor, and he does alot of basements. I help him from time to time and have alot of expirience with this.
I can also tell you how to create sound dampening wall and cielings if interested.