I've also contemplated a way to store my bike, when it was in the garage (admittedly took up needed space) I rode it more. My wife put it in our shed, which is behind a locked gate, it is no long convenient to walk out the door and hop on my bike.
I'd like to build a covered rack to store one bike for my backyard.
Not sure about what design I'd make.
Could be skinned with corrugated metal. Hmm, 7 or 8 panels at $10ea.
already $80 and haven't built the frame.
Maybe I need a solution in the garage. :-)