22.  All glass is 24oz Biaxial with a mat layer sewn to it epoxied into place. If you don’t want to hunt it down on the internet you can get it a TAP plastics.  The plywood is ¾” BS1088 grade Marine ply. You can get it in the SF bay area at McBeaths hardwood in Berkeley. Make sure it is stamped the floor person does not realize the difference between it and regular marine ply.  I had the chain plates made longer locally by someone who is no longer in the area, but would recommend seeing what Garhauer can do for you.