Look to the "mobile home" industry. They have a "top channel" that can be attached permanently that you probably wouldn't even see from a distance. Then you can use cheap interlocking vinyl soffit cut to size. It locks together for the run, then disassembles into small(20-24 inch?) sections for storage. Very lightweight. The bottom channel could be cut to workable lengths and attached to the ground with gutter spikes(reusable) if on the ground or maybe a bead here and there of some caulking if on pavement. It wouldn't hurt to incorporate a vented panel on at least each end to cut down on moisture and condensation underneath...
I can give you more info if you want to message me....
(NOT a salesman- worked in or around the mobile home industry for the last 30 years...)