Plywood is a common component in construction of many boats.  It can add structural components such as stringers, engine mounting, and the transom.  Very often it is used to mount other mechanical and electrical components as well.

Plywood works very well with fiberglass if the proper steps are taken during installation.

From BoatworksToday

In this show we cover some of the tips and tricks for fiberglassing over plywood as well as how to deal with tricky shapes and contours!