dont really know what you mean about the plastic wrap... as far as keeping the plants short, i dont know if there's anything you can do with autos, but then again Ive never grown autos. photoperiod-flowering plants: youre just going to have to flower REALLY early. 3.5 ft minus (1ft ? ) for the light minus (.5 ft?) away for floros leaves you with 2ft. youd have to flower from seedlings i think.