Boat Repair/Bonding Epoxy to Fiberglass- Question

[thill]

(I posted this in the "Materials" forum also. I hope this does not cause confusion.)

Greetings,

Thanks to everyone for your helpfulness. I've read a lot. There is a lot of experience here!

Epoxy resin is highly recommended for saturating wood before installation, but I understand that epoxy and poly resin do not mix. How do you bond the 2 substances together?

Here is my situation:
In my boat, one of the storage compartments was made from painted plywood. This box hung from the bottom of the inner shell of the boat, and was connected by glass tape and resin. This box has rotted out.

I want to fabricate a new epoxy-saturated plywood box, using glue and stitch methods. But HOW should I connect the epoxied box to the underside of the existing shell? This is a structural connection, and will have to withstand approximately 150 lbs of gear bouncing around at any given time.

Or...Would you recommend other methods to fix this situation?

All suggestions are appreciated. Thanks in advance for the assistance!