Replaced most of outer keel in A77, Blue Goose. It was necessary to plane off 10 to 12 mm to get to solid mahogany.
I used resorcinol from Aerodux that CP Adhesives stocks, the glue is also available from Spectrum Adhesives http://www.spectrumadhesives.com/contact.htm Structural joints that I glued 20 years ago using resorcinol are still holding together with no sign of failure. I will be using epoxy for most of the planking.
The next step is beveling and fairing the new keel material for the planking that will run in a continuous monolithic mold like piece from keel box to keel box (without a seam along the center). This replacement planking should work well because it will also be fastened in with the sand keels and keelson.