metal closet grow room?

http://www.abchomestore.com/ccp51/media/images/product_detail/stsc0108tod.jpg
I want to turn something like the closet pictured above into a grow room soil based. Any tips on how I would go about that? Thank you for any help!

I would either get some thick white paint and paint it or buy some Mylar,

you would need to cut a hole up top for exhaust and one in the bottom for intake, like in the sides

Im thinking youre thinking about CFLs a HID would get WAY too hot in that

I think you'd be fine with a 250w and a bathroom vent fan ($25)

hmm just as lake mentioned,
I would paint the surroundings with white paint, preferably glossy or rubber, not matte as the texture can still absorb light.
secondly CFLs, that wardrobe will be fine for 4 cfls, 60w ones will be fine hopefully with reflectors if u want to,....or...a couple 110w cfls toilet exhaust should work fine as vents.
Finally a humidity meter and thermometer.
I would say a humidifier but not mandatory in my opinion as your growing soil based, the moisture will create humidity.
and an internal fan would do, something like a 6' fan ...

I think LoopHole Nailed it. I sprayed the inside of mine with high gloss refrigetor spray paint. You will need atleast 3 cans to cover the whole inside. and get some window weather seal or door jam seal to cover the joints to block the light and that thing is stealth. I gotta say though I have a 400HPS in My cab that is the same size and metal. As long as you vent you will be just fine but its hard to have more than 4 plants at the same time in there. I had CFLs but nothing in the end beats HPS. The cost is a hit but in the end the ladies love it.