Well, I already have a 10' x 5' sheet of coroplast in the shed so I may as well use it. Plywood would be stiffer however, granted. I'm hoping the relative coolness of a diesel exhaust, combined with sufficient airflow through the cavity and an inch or so of clearance will prevent any melting! Won't be done for a week or so, as I have rear wheel bearings to change and a can of diesel purge to run through over the weekend.
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