Deck to stringers conection

[lunasea17]

When I removed the deck from my 76 MA I found that the floor was two layers of glass with plywood squares in between. This was attached to the stringers on top of about a 2" thick layer of some type of resin. Is this how the factory installed the floors? It was not adhered very well as I could just pull it off. Should I rough sand this base and glue the new floor over it with epoxy and cabosil or remove it to the stringers, build them up with plywood and epoxy, glass over and then install floor? Obviously the first method would be a lot easier, but I'm concerned with adhesion. I can't say I've seen anyone do it this way on this site. If you do remove the resin, how do you do it?