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Sorry for the confusion Steve. Acrylic is just the name for thick perspex. Nylon is better.
Nylon sheet comes in all thicknesses up to many inches thick and is very easy to cut and is not all that flexible. It is available at 'Industrial Plastics' suppliers.
If someone was concerned about damp in a shed or garage but dont want to attempt cutting thick Acrylic or Nylon they can take their nylon sheet and an exact drawing to an engineering workshop and they can laser cut it to perfection.
If they want to cut costs on materials they can buy a Nylon 'Food' cutting board for only a few dollars but they are generally softer, more flexible nylon.
If the ply is well sealed I don't see much problem. Marine ply would be perfect but it is VERY expensive!
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