The only thing I don't see listed for a stealth grow is a filter.

Are you running the lights as well as the fans from the PC power supply? I'm curious to the wiring of this, I'd like to see it in practice. But I truly think I'd be too proud to hide mine, and it would be a novelty piece. Will the lights you've chosen run off the converter? Or would you need to tap into the box and direct wire those? I'm afraid the smallest filter I would be able to design that would do this properly would be a 2" cannon (about 6" long) that would be elbowed out from your exaust, considering what your building, I'm sure your doing it for stealth, so unless you ported it out the back, it wouldn't do you much good. I'd also be worried about the CFM being enough to push through the filter, otherwise inadvertently expelling air through your intake. I do know of several high powered PC fans, with very low db's, like the ultra sonics - Could be good....

You got my engineer wheels turning now. I'd love to have this with a plexi cover displaying my moms Are you thinking about a drip feed system, or would you be physically in the case each time for feeding/watering? I'm also envisioning a small speaker/stereo system running from a disk player now, wondering if blue sound activated neons would hermie my moms, LOL... Okay - So I think you got me hooked on the idea.

Logistically the only problems I see are feeding, air scrubbing, and light leaks, as PC cases have many moving plastic components that aren't made to be light/air proof, but a quick taping on the inside will solve all of that. So leaks taken care of, we're left with feeding and scrubbing. The scrubber I mentioned would work for my purposes, but mine would hardly be for stealth, more for show, so would this concept work for you? A 45 degree angle upwards elbowed out from the exhaust on the rear of the PC- Since the case is 10" wide, we could easily do a 4" wide filter, about 6" long, and nobody would be the wiser if it were pushed up against a wall. The only thing you'd have to change would be your planned exhaust fan, and of course a few dollars in materials.

I think I would personally setup a drip feed system for this, and just stick a meter in the soil for safety sake. Of course again, I'd have the plexiglass so I could easily see the meter.