Those small Rubbermaid "storage box's" from L was on my list, but i had to rig up something else.
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Small chest of drawers can work too, if you fix it up right. I had a small TV cart, flipped it around and made doors. Works perfect.
The rubbermaid box
will need painted on it inside with paint for plastic, to avoid flaking. That is for light proofing and reflection. I was going to paint the inside black with a couple coats, and then a couple coats of white after.
Research methods people use in these small spaces and TAKE NOTES!! LoL, good luck!!