I have a curved raked transom that had a badly done repair (lots of bondo). I am rebuilding the entire boat and I used a sawsall to cut the transom off intact, following the "bondo line". Now it wasn't perfect and I need to cut the plank ends at the proper angle such that I can build the transom rim log and frame up the new transom, which I plan to build by pulling molds off the existing transom.
My problem seems to be one of which angle to cut at. I left the sheer plank intact and thought I could use a straight edge to drop the beveled line of the old transom down and around the hull, then cut on that line. Wrong! I'd end up shortening my keelson by about 2-3 feet! I hot glued some door skins as "run out" substitutes for how the planking probably looked when the boat was being built so I have something to take line on.
How do I develop the cut line on the planking so I have the proper rake for the new transom? Once I get that cut I figure I can laminate a rim log in place, but I need to have the planking cut at that finished angle. Sure would appreciate someone smarter than me figuring this out. BTW: The boat is a 1963 Ohlson 36' sloop, mahogany on oak, facing north, stored in a boat shed, used to be painted blue and is living in South Park Marina in Seattle. Anyone???