Wick- I think you really have something there, if you are going to do a replica- might as well be on the money. If I recall from your website the tang tapers to the rear. BTW how do you make that tapered cut in the handle?
I think the 3/32 is correct and 01 can't be beat.
And.... on the wood. I think boxwood, English Ash, and rosewood were three original choices. Those three choices are on Wilson catalogs. Other red colored wood includes two 1820 NW Co. orders that have camwood and barwood- and that's for the +L scalpers. Denig at Ft. Union says logwood but that may have been on the G-Crown-R/Furnis or the +/F scalpers, or Denig could have been wrong.
In the Carolyn Gilman L&C book she says Clark thought the wood was rosewood and a knife in the Carl P. Russell book was analyzed and found to be rosewood so............
Rosewood is pretty much available- I get mine at woodcrafters and seems to be pc so I'd offer the knife in rosewood as well.
On some of the originals the handles are more box "y" looking but such a style might not sell, you could probably offer it on your website as an option to anyone that is a pc nut.
Your scalper is the best, most accurate scalper of any custom maker I have seen to date. Nice job.
