Too many windows/openings? drafts/cold? Coop under construction

Working on a 4'x6' coop for six golden comet pullets.
Exterior height of walls 7'. Coop will be 24" off floor w/ enclosed storage below. Interior walls 5', w/ peaked gables overhead.
Walls covered with sheathing, felt, and plywood siding. Roof with sheathing, felt and arch. shingles.
Front 4' wall will have 2'x2' sash window.
Back 4' wall will have 2'x3' clean out door.
4' walls will have 4" ventilation along soffit that can easily be covered in cold weather.
6' side wall will have 40" x 12" door to int. nesting box with 36"x12" sash window above. Windows can open in warm weather.
6' side wall facing run will have 12" x 16" chicken door and second 2' x 3' clean out door towards the front of the coop. (added when I realized that I couldnt reach 6' into the coop from the back door!). 6' roost will run 10" in from this wall inside coop so the girls can look out the window on the opposite wall.

Design is similar to Cage Mahal and La Cage de Poulet, but I noticed they have fewer windows/doors...
Wondering if greater number of doors/windows will cause drafts/too much cold. Or will sheathing/felt/siding combo make it ok?

Live in CT. Input greatly appreciated.

PS In case you are wondering: Attached run will be 12'x6', covered by roof, and enclosed with hardware cloth, again, much like two inspiration coops indicated above.