Thank you for the replies. I have attached a line drawing, this was published in A4 format, so everything was on that one sheet! I scaled it up to my size, that was a job in itself. Since then I have managed to get a set of workable detail drawings on A0 size paper from a Scottish company- Brown, Son and Ferguson.
As I said in the first post I have only got as far as doing the keel, this is in 5mm thick oak, bulkheads will be in ply, with the centres cut out. I can't use solid blocks to build up any that are missing, there needs to be room inside for a battery pack, a rudder and a sail servo and their receiver.
This takes a lot of pre-planning and thinking, even down to ballasting it for sailing conditions, ideally ballast inside the hull but there won't be enough room. It will therefore have a detachable bulb keel (like a pond yacht) I am going to use its stand mounting points to double up as attachment points for this bulb keel, So when its not sailing it can take up room in our lounge and look like the real thing!