Gordon, I send this message as a pm, but the rest of the group might be prodded into adding their 2 cents, so:
I agree it's a nice looking stave. I don't claim to be an expert on west coast style bows, but I did as much research as my personal library allowed. Even with that limited amount of material it appears that there was a lot of variation on the theme of short, wide bows with short static recurve. I photo copied some pages from a couple of books you may not have and wrapped them with the stave. TBB also has a chapter that may be helpful. I assumed that everyone has a copy by now. I feel that the tips probably should be narrowed somewhat, but left them wide on the assumption that getting the recurves straight would be easier done first and the tips narrowed later, but then again maybe I'm backwards. Some of the illustrations in TBB show a fairly wide tip.
I like the dimensions that Pope published for one of Ishi's bows: yew with a rawhide back 55" 1 5/8 inch wide handle, 1 3/4 inch wide midlimb and 3/4 inch wide tips with a slight recurve ( see the table I copied.)
A similar Yurok bow was yew- sinew backed, 54" 1 7/8 wide handle, 2 3/8 wide limbs and 1 3/8 inch wide tips.
Recurves seem to have varied from none to very pronounced, with some done as a "bent tab".
Ron