I'm thinking 8 wide by 10 long with a 4 foot overhang on the porch, but I might go to 10 wide. I'm trying to find a place to build some trusses for me but they're hard to find. And expensive if I get them custom built. Maybe build two the same and use one as a sauna, extend the amount of time the wife will spend out there at one time
I've got a 30 minute quad ride into the cabin so a shed package is out.