Also, what kind of grip and tang are you going to make? An exposed full tang sandwhiched between riveted slabs like on virtually all dagger size historical ones I know of, or a more conventional sword-like grip with an enclosed tang like you see on some of the larger ones? I think either could be within reason, considering the overall proportions of the weapon...

Mikko, Since the profile is CNC cut to shape I can alter it to either form without issue. That part is fairly easy and I'm sure we will do both.

I cut 5 more blanks this way already , I'll make the additional ones for slabs.

Anyone have a pic or example with the handle off or broken?

Well, I found this pair at Bonhams (and also at Christie's). And there's one in this thread.

None of the tangs I am seeing really explain the slab handle form. Maybe that form just doesn't end up broken in a way we can see one. I am seeing exposed metal, that I assume is the tang. Perhaps there is a metal fitting the shape of the handle that the tang fits up into.

I suspect what we are seeing here is a 'framed' handle type assembly like seen on later Sheffield bowies. Very interesting.

Just a guess, mind, but I think there might be several kinds of constructions used: a framed or enclosed tang for the ones with solid guards, and a full slab tang on the ones with riveted sandwhich guards.