This sounds remarkably similar to the build method for an RC power boat that I got a while back. The "plan" is a full scale drawing of each part that you spray-glue to heavy, single layer cardboard. Cut out to the lines and CA the edges together. Then resin and cloth over the cardboard, inside and out.
What are you using for putty (I assume for fillets)? A local sail boat owner told me that he uses Bondo since his boat is polyester.
I used to swerve around my hallucinations, now I drive right through them.