I think that plastic would work great.
I haven’t used mine since, except I sprayed Flex seal on mine, afterword for a better rubber seal.
My surfaced board came out a little fuzzy.
The flex seal worked good, and I also learned
1 - Boards need to be flat. So a back up clamp system, like side tracks, maybe, for bowed boards.
I use weights on mine to keep them flat, during storage.
2- Stiff material, like my .035" thick magnet sheet, needs to be rolled the right way so the vinyl side is up, and the ends will want to curl down.
The board will suck it right down, that way, but if the ends curl upwards, I had to use tape to get a perfect suction.
As long as one keeps his boards flat, it works great!
The flex seal worked good on the fuzz, too. I rubbed it in, while it was wet.