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John:
As for what's sticking out the back, it's wheels. They make it much easier to pull the darn thing around. Make it as light as possible!! Mine is really heavy. (Better photo below.)
No, I only have the one opening. I'd change that too, as when it's time for the slaughter, they all congregate in the back, and it's hard to get them to the front. Plus, you find that you need to get to the back for various reasons, and with my design, you have to BE IN THERE WITH THE STINKBOMBS to do it.
The roofing is the fiberglass stuff- about $16/sheet, in the shingles isle at Lowe's. It works great, but it adds a lot to the weight.
I move mine usually twice a day- it's plenty light to do that, even with a bad back, but I would have made it lighter if I were doing it again. It tends to dig into sand, and leave tracks in soft soil, etc. Make it as light as you can depending on your level of predators. I made mine like a tank, and haven't seen a single predator.
Brad:
My birds stay in the tractor 24/7 once they're out of the brooder. For cold weather batches, I hang a heat lamp under the covered portion.