That coop is way too small for 5 birds.I was/am in the same boat. This past Saturday I modified the interior as a temporary fix for my problems. Are you able to make slight modifications to buy yourself some time/save you from the headache of finding another one?
I personally have no luck with craigslist, and local builders charge over $5,000.
The only prefab one that caught my eye as being of decent enough quality to survive Montana winters is the OverEZ brand.
The smallest houses 5 chickens and sells for $799. The dimensions are 34” x 45” and 4’6” high. It would fit through your fence and is supposedly easy to put together. There are add-ons for electricity, wheels, and runs, but that will cost you.
https://overezchickencoop.com/product/small-overez-chicken-coop/