We have not offered or released the padding we found for carpeted decks. There is a California vendor with a very similar material and we will get their contact information for you.
We cut the carpeting with a hook knife and razor knives. We trim it up with large Wiss brand poultry scissors. Quality carpeting and thicker material doesn’t unravel nearly as bad.
And we suggest Weldwood brand contact cement as a carpet adhesive. Double stick adhesion (carpet and part glued) is best and it’s hard to get good placement. A broom stick will help to retain the carpeting and roll it up when installing, unroll it as you progress slowly.
Spread the glue with a brush on the boat, pour the glue out and squeegee the glue on the back side of the carpeting, with a plastic squeegee.
BCB