I've been using something like this
How is the nut attached or is it free floating, held in place by string pressure? Not the fret, the bone.
Hi, on some acoustic guitars I built in the 1980's I used this idea.
i made the bone nut blank extra wide put a saw cut down its length and on one side of the cut I shaped the nut and and slotted it, on the other side I shaped the zero fret. Nut and fret all in one piece.
I thought it a was good idea so as to be different, but too labour intensive.
i'm digging it. how do you know what size fret to use? swap them out? i used to use finishing nails, slide one in, if too large or small, slide a different one in.
Use the jumbo(large fret) it's used pretty much allot the time for a zero fret. At least that's my understanding!