Yes, thats right. I have decided to build a boat out of a plank. Best 18mm pine, with hardboard sides and 4mm ply bulkheads….its going to be an HMS Furious or Glorious (i will make an add-on flying off deck and single 18" gun turret to add to the HMS glorious to make a Furious -l ook it up). I am frustrated at the moment as some pics just will not post to this site despite only having been snapped this morning/never mind. Despite scepticism (?) at the pondside today the boaters had to agree the hull looked ok, but when it was test floated there appears to be a stability problem. despite being ostensibly rather heavy (in comparison to a TURBINIA which I am building in balsa/lite-ply which is approximately the same 48" length)) the floaty component ie the plank,  is VERY floaty, and after a few batteries and  weight to simulate the wot not (the superstructure and associated r/c items) were added the whole thing was very tender, a bit of an  understatement. I can see this requiring some hefty lead weight being screwed to the bottom of the afore mentioned plank. BE WARNED! A sail vessel will need NO  HULL construction to float very nicely thank you. Its a bit odd building a boat like this… I have had the thing screwed up tight in the workmate while I use a hand belt sander to shape the hull, and have been using large G-cramps as well !!! . i will try to post pics from my alter-ego ashley needham 2 at work on Monday. Ashley.