A tip is to use a BLUNT scriber to makt the lines so it just bruses the wood and compacts it then use a fine Staedtler permanent pen (fine) get one of theones with the gold "F" on they dont run and you can even draw on glass and it wont come off, the first coat is best lightley sprayed to seal the lines. if you lay out with a soft pencill you can draw your margin and jogels first and then give a light sand to get rid of them , dont use a rubber as it leaves marks that show in the finnish.

you could always plank and use cartridge paper to show the corking I use lime or pear as it has very fine grain that does not show, below a picture of a bit of deck with lime 1.5mm thick or about 3/32" over there.

I take it you know about http://www.faireyownersclub.co.uk/ there is a good picture section on it now , you will find the decks are of a light timber

Peter