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I'm considering making them their own space in our existing space outside. Just section off part of the run and install a small temporary coop for them... Not for immediate use, of course, but for about a month from now. Would put them just over five weeks old.

That sounds like a good plan!

I'm thinking the coop itself will be made from the current Rubbermaid tote that they live in. I'll just add a 1x2 for a place for them to roost.

I bought materials today, so I'll be ready soon to start the project. I think it'll be good for letting the birds all get to know each other. I'll probably start them outside here in a month or so if they have enough adult feathers. I was told that's a way to gauge if they're mature enough. Our temperatures for a while will be highs in the 90s and lows in the 70s.

Later, I'll reuse the material to expand the run a bit. Little extra space never hurt.

They should be far enough along feather-wise for those temps. Sounds like a good plan.

I'd sand/round the edges of the 1" x 2" roost bar, to prevent slivers and foot infections.