Lester, OK Ok I still think you should try Hugh Scullion (http://www.hmsmusic.co.uk/index.htm) in Scunthorpe, but....
If you are any good with your hands, get a copy of "Make and Play the Dulcimer" by John Pearse. It includes the fretting pattern that you need to make up the fret board, Be warned though that the OCTAVE fret (half scale length) is not accurate. I have a copy of this book but the fret pattern is long gone.
The ISBN is 0 86001 204 2. It also carries the number AV 5005T.
The book was published in the UK by Wise Publications and copyright 1970 ATV Music Ltd, 12 Bruton Street LONDON W1X 7AH.
Are you Lester of FOLKWAVES fame?