so i dinally have hauled out my 1974 balsa cored beuty and lo n behold contrary to everything folks had said, shes checking out. just fine. the only spot of rot is on the stern quarter where a chainplate bolt had been leaking in. i cut out the wet area after testing for the perimiter with eighth inch holes and found a interesting structure. overtop of the glass inerskin is a layer of plywood squares, one inch by one inch. then over a half inch of glass on the outerskin. while reading a previous survey. i learned that this ply was there to add stiffness to the chain plate area for mizzen caps and main back stays. im wondering opinions on how to lay this back up. ive gutted the wet plywood. and am now thinking of just replacing it with balsa coring for ease of installation. anyone?