Jaromin dulcimer kit from Annalisa's Crafts
Instruments- discuss specific features, luthiers, instrument problems & questions
Ken said "It looks like he/she choose to copy the fret board of cardboard dulcimer manufacturers rather than go the extra step of having the fretboard end at the body of the dulcimer which would require extending the body of the dulcimer and repositioning the string anchors."
Having made a couple of "copies of cardboard dulcimers" using craft plywood, I'd say the body length was determined by wanting to cut one-piece sides from a 12 by 24 inch sheet.
You are then faced with a choice between a shorter VSL or overhang. For a shorter VSL you need to establish a new fret spacing which can be done easily with calculations, but requires more than woodworking expertise. The neck vs. fretboard issue is indicative that the kit maker is more woodworker than dulcimerian.
Looks like a good design to me, even if non-traditional.