Dude, you can make yourself a nice little grow space with that closet. My setup is in a closet basically the same size as yours. What I did was split the closet into two seperate rooms. One for veg and the other for fowering. These are some picts just to give you some ideas. I ended up takeing the closet doors off and using the Panda film. it allowed me to make the flower room light proof.
I also mounted both my exhaust fans in the attic. A 500 cfm for exhausting both rooms, and a 465 cfm to pull cool air threw my reflectors.
