I'm actually about to start moving forward on this, just had a slight interruption with Irma. Building a small platform at the end of my driveway to set the box on....it will become a tool shed and my driveway will get a PVC hoop and tarp carport.
Going to build the basic superstructure with 1X1 hickory glued aircraft-style, skinned with really thin cedar ply/luan, covered with 1" foam, edgs radiused to 1" curves, and externally skinned with glue-soaked canvas, linen, fiberglass window screen, or a combination of all thw above