That looks fantastic.
Hardware cloth well secured is a must. Expanded metal works well too.
You won't need a heat lamp unless you have chicks. Most breeds of adult chickens can handle temps well below 0 F. Heat lamps use a lot of electricity which ain't free.
By selecting breeds adapted for one's climate, heat will never be needed. The breeds that most people keep were developed in cold climates in the 18th and 19th century or even much earlier. How did they provide heat for them without electric and heat lamps? They didn't. They still exist so they didn't die.
American class, Jersey Giants, Wyandottes, New Hampshires, Plymouth Rocks, Delaware, Dominique, Buckeye, Java, Rhode Island - those are all developed in some cold states.
Chanteclers - Canada is real cold.
Araucanas, Ameraucanas, EEs. Chile gets real cold.
Continental class, Welsummers, Barnevelders and Polish come from Holland. Holland is cold in the winter.
Campines, D'Anvers - Belgium is cold in winter.
Marans, Houdans, Crevecoeurs, Faverolles, LaFleche - France gets cold in the winter.
Orloffs - Russia - pretty darn cold.
Naked Necks - Romania - pretty darn cold.
Jaerhons - Norway, yeah cold there too.
Icelandics, need I go on?
Same goes for the English class.
My point is, if you must have birds like Shamos, Cubalayas and Fayoumis, be prepared for a big electric bill.