And someday, when we have coops full of rescue chickens, we'll have rescue goats running and playing on their goat fort. /LOL you need a couple thick poles with a 2x6 going across from one to the other. Goats really enjoy that. Telephone poles work real well too.
I build my goat sheds big enough to stand in. My goats are short. Doing something like this would maximize the goats' use of the tall space. Great idea! I'd add edges to each shelf and bedding on the shelves. www.oakhillfaintinggoats.com