The closet could work just fine. If you get rid of your 1000W I would try to trade it for 2 sets of lights, a 400W and some 2ft or 3ft shop lights, because in that space you could split it into two compartments a small veg cab on top consisting of about 2FT and a flower cab on botem with the rest of the room. If you were able to grow from clone you could grow 2 and ahalf FT plants in there, about 6 at one plant PSF or do a killer SCROG or a SOG of about 12 plants. Any way that is my 2 penny's on the matter.
Also, the cab I have is one in front of the other, since you were wondering.
Adieu