Meanwhile back at the boat and hoping it's third time lucky, a final rebuild to prove the method and materials posted on the website at www.teledrone.com
And first off, marking up the pattern on the 2' by 4' sheet of 3.6mm plywood and I have gone large with the felt-tip as no-one is working to microns here.
Deck to the left and keel to the right, marked up in straight halves and a dotted line down the centre of the deck to mark the location of the spar... easy-peasy.