First Grow room set up is there anything else?

Ok so Im looking set up a max of 4 plants growing at all times to stay away from any hard time. Everything is purchased so this is what Im working with.

Im moving into a new house and I have a spacious unfinished basement to work with. I plan to frame and drywall two grow rooms 4x4x6.5 each. I will be growing 2 plants in each room with the scrog method at 3x3 leaving 6" away from the walls. Lighting I will use 1 in each room
http://cgi.ebay.com/400-Watt-Digital-Ballast-HPS-MH-Grow-Light-400W-System-/220602499662?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item335cef024e

Ventilation- Each room will have one of these
http://cgi.ebay.com/NEW-4-inch-CARBON-FILTER-FAN-COMBO-inline-odor-scrubber-/390111942001?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item5ad47bd571 both rooms will have seperate exhaust and intake. The fans will be for exhaust obviusly and the intakes will not have a fan but will be at about 6". Each room will have a rotating bedroom fan.

I want it to be a continuous grow where both rooms will veg and flower. I will take and stasis the clones right before a room is about to go into flower. Then when the other room is rdy to be cut and dryed I will put the 2 new clones in that room and start veging and keep a continuous grow going rinse and repeat.


Questions:

I want this to be stealth incase a mother inlaw or family member comes down for some unknown reason.

1) So whats a good way to keep attention from my newly finished drywalls?


2) Whats the best way to stealth the doors?


3) Is there a reason why people make a veg room and then a flower room? With scrog idk if moving the plants is a great idea so if I use the HPS/MH lights I wont have to move them.


4) In winter the temps outside can reach single digit. If I run the light at the colder part of the night they should be ok but when the light is of and new cold air is coming in what should I do?


5) Should I have my intake coming from fresh outside air or from the basement air?


6) Should I lst or fim before the plants are to the screen?


7) How often to change carbon in scrubber?


If I could get some help I would greatly appreciate it. Any comments welcome!
 
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