Irontom, I think you just said it.. Time, material, And use determine the design, as well as the tools and expierience. As for actual facts, It is all spectualtion , unless you have personally spoke to the builder or shot the bow and have expierence and have a good knowledge of archery. I don't think some bow or bowyer 7,000 years old is here for us to share with orbow to shoot. Although , there are parts of or a whole bow out there, I am sure no one has or would try to shoot one. So all we have is spectulation on the design and performance from the bows we build or some one has replicated..And I am sorry there is a big difference from the historian and the actual builder and or the builder of today. Buy the way , I measure authority from the passion of the person, not knowledge. We can always say this or that, but when do you believe or when do you not believe, That is up to the person who is spoken too...That being said , because someone speaks of knowledge, That doesn't mean they are of authority.By the way Tim Baker is still out there, He has instucted me to contact P'A' , When I asked him for more info on holmey's. This is only my opinion of an old man seeking truth. Denny