I built my cabinet in an armoire, and after some tweaking, reliably pull 6 ozs of grass from it every 2 weeks or so.
I basically just built the whole system from mother to veg to flower SoG style using Al B Fucts guide, and its working great for me.
I got the armoire off craigslist for 50 bucks, and it sits in my office in front of a window, where it vents in and out thru the window for air and cooling.
You would never know in a million years that it was a grow cabinet.
Armoir are cool cause they look like they are supposed to be in your house, and they are very easy to make air/water/light
tight with a little aquarium silicon and some weather stripping.
-J