BB1,
The kerfing saw was pretty easy, I modeled it like a back saw with adjustable fence like a plow plane, refer to the photo showing the saw disassembled. 
BOM:  pine board for body, saw clamp, and two piece fence, 3/4" dowel for fence, cheap saw blade from hardware store the was labeled as a dovetail saw with flip handle therefore the double sets of teeth, had a handle like a Gent's Saw. The hardware - two threaded inserts with matching bolts, one hanger bolt with matching wing nut.
I made the main piece similar to a back saw, with adjustable fence like old wooden plow plane.
Can't think of any further details, but please ask any questions.