According to sources online, they were not plywood as commonly believed but were constructed of mahogany planking with a layer of glue impregnated cloth between inner and outer planks.
Understand. I’m remembering 60s descriptions of them.
The hull was a double hull of mahogany, the planking angle opposite for each layer for strength. There was a layer of canvas between the two, probably impregnated for waterproofing.