Fellas,
the bow is white ash...it's quartersawn and tight ringed (between 1/16" & 1/32") the other woods I use for these NA bows are black ash, walnut, and red elm.....I believe that the grey elm (American Elm) will also work well but have not used it so far on the short bows.
Also hickory would be a good choice.....
One comment about the tiller... I made the bow bend before the limb cut-outs were made....and it was a little stiff tiped but after cutting in the limb design the limbs just "opened" up some and it settled right in to a pretty nice tiller profile. Also it did not drop any weight...just gained a little draw length.
rich