you will need to seal up the door so its air tight when you close it.
you will need a very good scrubber, a place to vent it( dryer venting), and at least a static inlet from somewhere as well.
top your plants, prune for at least 6 main stalks, and that will take a shit load of the stretch out.
dependin on your lamp and how fast ya can move that air outta the closet, you may have some heat issues to deal with. air cooled hood may be in order, use the same vent as the scrubber, inline from the lamp through the scubber then outside.
Brass growin in a apt