If you look at just the run portion and cover it with tarps, that is what we are using for pasture shelters for young birds. It is nice not to have to clean up after them, just slide the shelter. The shelter is in an electronetted pasture, and the birds roam that during the day and are shut in in the shelter at night against owls (electronet has kept out the rest of the riff raff).
I think yours looks much better than ours, and I am sure you will get a lot of enjoyment out of it.
Good job!