Just received the plans for this boat from My Hobby Store, the quality is not good, for the example the drawing with the various sail dimensions is nearly unreadable, but I can worry about that when necessary. My problem is that the plan shows the hull built over Formers, or Shadows, now, do these Shadows stay in the hull or is the skin not attached to them? It seems to depict a Vane Steering model but that is relatively simple to alter, Question is , Do I leave the Formers or Shadows in the sheeted hull? Also as I have no access to 3mm ply of this length I thought that 3mm balsa sheet and glassed inside and out should do the trick.Yes?