Here are pictures of the Cardboard box setup. I decided to go ahead and make it since it cost less than $10 to make.

Parts:

Cardboard box: 23"x23"x20" - $4.00
Emergency Solar blanket(Mylar) - $1.96
Scrap Plywood: Sweet Talked a hot Home Depot rep - Free


Parts I already had:
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Fans
Lights
Tape
staples
power strips


Total height with the box flaps pointed up is 30 inches (2.5ft).

Here are a description of the pictures.

Picture 1: Box complete constructed. This view is looking at the exhaust fan hole which is 15" x 12". I left 4" in each direction of the card board to make sure that I didn't sacrafice any unecessary support. You might notice some cuts are uneven. I didn't have a box cutter. I ended up using a steak knife to make all my cuts on the cardboard. oops. Not optimal, but considering what my previous setup was.. it's not horrible either.

Picture 2: Close up of the exhaust hole. The hole no the other side is the intake hole. You might notice the mylar is a little wrinkled. I have a pretty bad back and it was ALOT harder than what I anticipated to hang the sheets inside a completely enclosed area. If I had a second set of hands I'm confident I could've gotten everything smooth. I may go back and do this later. Or I might just say screw it and paint everything flat white.

Picture 3: This is a picture of the doors I said I was going to cut into the shape of brackets so they would fold out. The doors are closed at the moment. You see mylar wrapping around the front. Some of my sheets were much too long. Back started hurting very badly at this point so I just did the best I could.

Picture 4: Picture of the doors open. No the flash is not on. I had one light that is pretty dim on. Looks like the light reflection is fairly decent even though I didn't get to get it all nice and stretched and tight. Other objects you see is my wide screen tv, part of a plant. A red ball chair which is pretty cool, a piece of art, and my lovely shoes I got in Amsterdam. lol.

Picture 5: Picture of the intake hole looking to the exhaust. If you look to the upper left you'll see a poor plant dying. My cat pee'd on it . And to the right are bags of potting soil and perlite. YAY