need some opionins

ok so i have this closet , it's 21" deep ( inches ) by 46 wide and goes all the way to the 8foot celling ..

their is a nice shelf at the 6foot mark and i can vent through the celling to the attic so i was thinking i could use the shelf for fans / filters / etc. this would req that i line the walls with poly or even mylar and cut the rug - not to mention some sort of floor try in case of water leaks , i would like it to be a sealed environment ( pets , bugs , etc ) so a poly/duct tape soultion could work , but it could also fail miserably , and splitting it in 2 ( flower/seedling ) could pose issues.

on the other hand , i could spend a few extra $ and get this http://www.thelashop.com/catalog/Reflective-Interior-36x20x62-inch-Plant-Dark-Room-Grow-Tent-p-843.html it would fit ( i may need to jiggle the sliding door a bit ) but also leaves me with less space to work in ...

so basically , anyone have any pros / cons with either method?

with 2 rooms in there ur gonna have to veg with cfls or t5s unless u have some serious ventilation... i didnt check the link but i presume its a tent... fuk the tent! its jus not needed $ unless u need to be stealthy like kids around or what not... u could also go with autoflwoers so u can veg and harvest in the same room with the same light

ya i was planing on doing seeds and small plants with cfl to start ..