> craig,by now you've probably finished the boat, but here goes. I've been rounding off the chine to the middle layer. Just for the hech of it make a few test pieces, rectangles of plywood glued like the chine of your boat,and gladded appropriately. Now go beat them up and stand on them. I think the depth of the fillet and nature of the glass on both sides has a lot to do with the strength of the joint, possibly a little more than .5mm-1mm of plywood contact. one of the interesting things I noted in my back yard testing was that joint failures occurred at the edge of the fillet,1 1/2 tape accentuated the stress riser. My first boat was a Patuxent that I rounded down to the fillet! and glassed over the outside with 6oz.and 9oz. tape with two layers of 9oz tape on the inside as recommended. funny thing,the boat was heavy.