Looks good to me, but I see what you mean by over built. I will just use an OSB siding material for the walls and roof, add a layer of tar-paper, then cover with cedar shingles that I have left over from the house. My plan it to put it on pier blocks, 18-24" off the ground, and install a single axle for wheelbarrow wheels on one end. I have plexiglass for windows, and eave block vents also left over, so it will be a bit over built, style wise, but not extremely heavy.

Would 1/2" hardware cloth be big enough or do I need to search for 3/4", if that even exists, and do you cover that roost poop sectio in really cold weather?

I've also considered an exterior nesting box. Your design gives me an idea.

Picked up the last of the inhabitants for the coop, 3 Rhode Island Reds, 3 Gold sex-links, and 4 cornish cross for an experiment in meat birds, just because we can.