dude.. i had a 2x2x4' tall veg space, with cfls, and it was still cramped.
Get a $150 wardrobe from ikea here is
the link
and a picture
Then you have a space for equipment and your ballast in the drawers, you can use the smaller side for veg, and the larger side for flowering. Hell, use it as a divider in a room if you dont have the wall space. Or put it on caster wheels so you can move it if there is a door or something behind it.
Really man, I have done the math all sorts of different ways and this is the best solution for a small, contained, veg and flower chamber that is prebuilt for the most part, and still cheap. Unlike the $2000 premade grow cabinets..
Hope this helps..
You can find similiar products by searching for 'Closet Organizers' or 'Wardrobes'