I play a little dulcimer but not with 4 equidistant strings. I bought mine in Crossville Tennessee. I did see some beautiful ones made by Warren May in Berea Kentucky. Mine is tuned in the usual fashion DD A D, but because there is no 6 1/2 fret some keys cannot be accommodated without altering the tuning. I lived in Toronto for about 20myears and am now resident in Whitby. I know of a Tam Kearney who lives in Toronto and makes dulcimers also.
Nice to hear from a dulcimer player.