I have a big pigeon loft that is available for FREE. It has three sections (middle is left open right now) and is built very well. This thing is framed with 2x4s and covered by OSB on the outside.

I’ve used it to separate my breeders from my squeakers. No issues, we’re just moving soon and I won’t have room for it at the new place.

You’ll need to plan on someone using a loader to load it for you. I know a guy that can be paid a small fee to load it for you unless you arrange something else.