Here's my 11" x 11" CFL cab. It has 115w of CFLs (5 x 23w) with a carbon scrubber for odor. These pics only show 4 lights in the box. I added a fifth light hanging down in between the two Y adapters.
I started with a used cabinet I picked up for 5 bucks. I added a base made from 2x4s to raise it off the ground for ventilation. Cut some holes in the bottom for air intake, added some black painted pvc elbows to the vents, and wired the box up with lights.
I really liked the small profile of the box and wanted to try to add a scrubber without changing the footprint (other than height).
I also found an old super quiet bathroom fan that happened to be enclosed in a box the same size as this white cab and it would sit on top just right.
I cut the top off the box
I made a carbon scrubber 'sandwich' out of 2x4's, hardware cloth, furnace filter and activated carbon.
The scrubber sits on top of the cab and is held in place with foil tape on all four sides. This holds it tight, yet allows for pretty easy removal to change the carbon in the scrubber.
Here it is all put together
I ran one round earlier this year in it, I'll show some pics from that in another post.
Currently there is a C99 BX1 in this cab about 20 days into flower.