The stats look fine on the coop.
For the "gable" vents, I would suggest that hinged shutters , so you can control it. Temperature, wind speed and direction change constantly, so your setup should be flexible too.
I just broom clean. That is it.
Ordering chicks now makes transitioning from brooder more difficult. And be ready to handle the challenge of integration.
Dave,
I have heard others say their birds like snow. Mine never have. So I would say no.
Never had any problem with temperatures in NJ. Temperature is not as harmful as high wind that penetrates their feathers and downs.
At 5 to 6 weeks, I would say they need some heat, if night temp is as low as you say.
The heat lamp you mentioned is probably 150 to 250 watt. way too strong. You can find incandescent flood light from 50 to 100 watts at HD. I use 45 watt black bulb in my grow-up coop of 3x4x3. No problem...
Solar and other power sources may be unreliable.
Regular power is the most reliable. The distance you can use an extension depends on the power draw, voltage drop and conductor size. I use 100' of #14 for a heater of 40w and a CFL. The cord is plugged into a GFI outlet.
The cord is there...
Gullwing is the name.
The problem is snow collects where the pitch changes.
If the walls are higher. You can have a regular roof with more room on the same foot print.
I think sacrifice one of your birds to the national symbol is a noble deed.
Anyway, my birds always ran for cover when arial predator was present. Do your birds have places to hide?
OP, don't know how wide the gaps are on the barn wall, but if wide enough for wind to blow through, I would suggest thin plywood or poly from the inside but leave the top for venting.