I still remember your photos - transom and sides cut down to install wood blocks for the engine and oar locks. Ran into the same cost (+ time) vs weight ratio thing when helping to building a 39' custom a while back - hit the water at 13000# (5900# keel - carbon spars). Rudder post is carbon fiber, 5' draft, sized to support the boat from the tip of the rudder - 26#. I will admit, the owner did install a granite counter top next to the stove - however, Lear jet stuff - 3/16" granite with aluminum honeycomb backing. My launch present to him was a Mach meter off a Bell X-1.