I really like the idea of a small grow room like a closet. One of the growrooms I saw in a video I downloaded was 2 huge cabinets. Which made me think of closet/shelve units.. My idea now is to use/build an closet with two swinging doors, and two shelves. One for the bud/seedlings and one to grow. I was thinking of using the dimensions roughly size of yours.

Can you tell me how the plants are going now? did you reduce the heat inside? Or make any major changes to the lighting or ventilation?
what kind of seeds were they?