Go get three sheets of plywood Screws, calking, mylar, 2 bathroom fans and some dryer hose. Cut the plywood in half, into 6 4x4 pieces. Times the thickness of the wood by 2 and trim that much off 1 end of each board. Screw them together into a cube, cut two 3" holes and a door. Put your light inside, Line it with mylar. Mount everything on the back. Stack boxes on it to make it look like a stack of boxes in the guest room.
I say 4x4 would be best for a 1000w light. Because I'm running a 400 in a 4x4 and I could realy use twice the light, at least. They are stretching a bit. But it's what I had to work with at the time till I can get a bigger one. I will be going 1000w MH and HPS asap.
I'm doing 16 plants next grow. So I might do 2 600's if I can aford it.