I'm about 75% complete with my current build, which is a double plywood FRP lined epoxy resin tank. It's a plywood tank in a plywood tank. Has Max Bond epoxy in the plywood joints. Used a FRP adhesive to bond the FRP to the inside plywood. Then poured fillets of MAX ACR epoxy resin in all the seams. Then poured 2 layers of epoxy resin over the FRP to make it fish safe. Then fiber glassed the outside of the tank.