[MetroMPG]

Rokeby: yup, a "kit/plan approach" is probably the only practical approach.

You could duplicate this tail by simply replacing the cardboard with coroplast, then paint the outside to UV-protect it. That would make it durable. Could even retain the "scrap wood" frame.

It might take two or three 4 x 8 sheets (rough guess) and might require some different attachment methods. (EG. the hot glue gun may not be the most appropriate way to make a durable plastic version!)