I built one similar to this that I'm using right now, works great. What I did was take a 3 bulb light bar for like above a bathroom vanity, they're ~$15 at a home improvement store. From there I stripped off all the fancy outer stuff so it's just a metal back piece with sockets and wiring. Then I screwed it onto the inside of a mid-sized plastic storage tub which I had spray painted white. Next I took 3 2-way light socket splitters and screwed them in turning 3 sockets into 6. I also cut a fan slot and put an 80mm computer case fan on there. After looking at yours, how did you power it? I was in a hurry and ended up using what I had on hand (computer power supply plugged up to a tester to turn it on with a 5v rail running to the fan. I know it's possible to do it without a power supply, but it's what I had on hand.
Props on the cool setup, I like how it lets the side fold up to view inside.