I came to this design myself by doing experiments with different things. But everything was on the planet before we thought on it.
Sorry to ressurect an old thread (I haven't been on here for a while), but the question on the application of the mass principal brought me to this excellent build-along.
This now gives me a wonderful perspective on the English Bronze-Age 'Edington Burtle' bow that I got to examine in the Museum of Somerset a year or two ago. This dates from about 1700 cal BC and is a hollow belly design made from Yew. I had thought that I had previously posted pictures on this forum, but a quick search suggests otherwise. Here is a link to a full writeup with photos in another place - I hope I'm allowed to post this link here...
http://paleoplanet69529.yuku.com/topic/54123/The-Edington-Burtle-Bronze-Age-Bow-Photo-HeavyGreat work. My thanks for posting once again...
Peter