Add nests and roosts...some dimensions would help.
Here's some height tips:
https://www.backyardchickens.com/articles/coop-stack-up-how-high-should-stuff-be.73427/
"Ya get what you pay for" haha! Sorry.
Most the coop plans out there, free and otherwise,
are about as bad in size and design as the prefab coops.
Do some searches, browsing, and reading here on BYC,
and you'll find that too small a coop can bring BIG problems.
It is a nice shape, attractive...