sorted out my drawings, based on John Lamberts excellent sheets. transfered them to the doors of an old fitted wardrobe and stuck them all together.
But i dint want to do that so i threw them away and started again. this time i used 10mm balsa as the frames and covered them in thin ply to get the cones. totally ignoring the fact that the front cone wasnt a cone. sure it tapered but in a arc. so the shape was transfered to papaer and then dived in to 10mm sections. these gave me the circles diameter to create the shape. these were cut out, cut in half and glued together. then shaped with my trusty perma grit. the whole thing was then glued to the half hull. job done.
the whole thing, once i am happy with the shape and got the top and bottom to match,not tried them yet, will be coverd in resin and thin cloth, cleaned up and used as a plug to mould the actualy floating, sinking hull.