I light the chamber with a series of those Fluorex fixtures (the big ones - the ones made to light 2000 sqft). I do have to re-arrange, though, as the bical has outgrown the "usefull" light radius. Have some thinking to do. I have an idea, but too many plants to implement it - or maybe I can if I re-arrange... Have to brainstorm.
As far as the grow chamber, it's really easy.
You need 12 6 foot 1x3's for the frame
place the first four on the floor in a square, and screw the ends together (I highly reccomend using a drill to bore the screw-holes first to prevent splitting).
Then, in each corner, stand up one of the 1x3's and screw it in so it's verticle.
Next, add the remaining 1x3's across the top, screwing them in, to complete the frame.
use a staple gun to attach the shower curtains (you will wind up needing five - four for this part) to the back, sides and top. Leave the front open for now.
You will need four more 6 foot 1x3's now, to make the door (and at least two door hinges - forgot to mention that in the other post).
First make the door. Cut one of the 1x3's into two foot sections (you should get three of them). Use two long (sides) and two short pieces (top & bottom) to frame out the door.
Attach to door using the hinges to one side of the front. "Close" the door, and line up the remaining 1x3 along side it, and screw it in to the top and bottom frame supports (this gives you something to close the door against).
Now, the finishing touches - attach the shower curtain (recommend a clear one for this part) to the front wall, cutting away the extra - keep this and use it to cover the door.
Voila - done. I did one more thing and added a latch to keep the door closed - but you don't have to do that part - I just have an inquisitive cat & two children, LOL.
Oh, I don't really have any good pics of it because the room I built it in is too small - I can't get back far enough from it to snap a decent pic.