Just took some measurements and its 1, 5/8th wide to mid limb is then a taper from there to 3/8th tips, recurves are an inch at the base. Just put it on the board and its 69lbs at 27.
The bow is all sapwood as are all of the wych elms I have made. The heartwood only seems to kick in on much older larger diameter trees and then its probably only about a third of the overall mass. Easiest way to tell a wych elm is the leaves, besides being generally elm looking they also tend to have little devil horn shapes to the leaves and stand out most because they feel like sandpaper.