That's a beautiful bit of Yew and a handsome bow.
I hope you won't mind if I say I don't think it needs rawhide on the back, the sap wood should do the job just fine. (As an Englishman I think it's almost a treasonable offence
)
Or maybe it's just some added protection against rough use?
Yew really is a pleasure to work with.
I've just finished a Yoeman's Yew bow (self nocks no grip rather rustic), the Yew is nowhere near as good as yours, poorly defined sap heart wood boundary, coarse grain, but it's still a handsome bow.
Del