Fig. 3.1.2i,j,k Time to move on, girders, stringers, edge tubes and all that longitudinal members goes in place. And it actually all fits within a millimeter (j), which... to say the least, is better than 0.01% on 14m boat - well done Graham, well done Ladislav. Its actually rather impressive to see the 73mm dia x 5mm 5083-0/H111 aluminium tube to wrap around the boat shape as if it has been waiting for it since it has been extruded.