Great to hear of yet another 1975 18SF. I have mine wide open right now and just crawled out of the bilge. The box stringers are 26.5" apart which corresponds more or less to the coffin box and also the first set of steps from the keel. My stringers (which I am in the process of rebuilding) are 3/4 - 1" below the liner sitting on plywood and Potter Putty. If you want to be safe, you might drill oversized through skin and 1/2" plywood core and fill with thickened epoxy. My lean post landed with one screw on the cover of the livewell which I have also removed. Happy to send pictures.
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