Sounds like a viable design plan...but as junebuggena suggests, you also need 24/7 ventilation that is protected from the weather. I know you mentioned being able to unsnap a few to open, but that might lead to a flapping piece of plastic.I would also like to add that the above method allows ample air flow which can also be varied as needed by unsnapping a corner of one or more panels and can also be easily removed on unseasonable warm days. I live at the coast and the nightly lows average in the low to mid 30s only dipping to the teens a few nights a year but coastal areas are a cold damp and windy....cuts right to the bone!
Which 'coast' do you live on, State of....??
Got pics of your coop and run?