The roll/velcro/zipper sounds good. Thank you!
The closet will vent into the 8x4 tent. From there it will vent through 6" carbon filter/exhaust. I dont see any other option to vent from the closet. The end of the tent is positioned, 6" from the only feasible spot to vent from closet. I can get better pics if needed, in an hour or so.
Air exchange for proper Co2 replacement is my main concern. 2nd is the smell. I live in a legal state and have my medical card but, the fewer peeps that know, the better I sleep.