Didn't do a whole lot today other than set up the strings & rear "transom" you see below. Obviously if I follow the strings, I'm not aiming for curvature (going fore/aft) on the cardboard prototype.
Next step will be to cut out two more intermediate cardboard "bulkheads" that will help support the outer skin and the overall structure. There will be some triangulation in the aluminum frame too. Basically I'm winging it.
Should have more time to work on this tomorrow.