Man, that would be sweet. I would pull the cover off, re-cover with Panda Film, and then put the cover back on to hold everything in place, and not draw attention.
You could grow some BIG plants in that thing!!
As nice as it is to have free light from the sun, it is a pain to cover and uncover plants every day, when you want to flower. A couple of MH lights with umbrella reflectors, would probably do a great job in there, an 8" carbon scrubber would probably come real close to cleaning your vent air. That's what I have in my 12x20' greenhouse now, it pretty much does the trick, as long as I don't have my side rolled up, but that's not the filters fault.