Old thread, but because of the short time it takes to build one of his  horse bow designs, and  the end results of it's performance it is worth renewing.I have built  a dozen or, so of them  all modified. His design always seems to shoot harder than mine. He uses top line tempered bamboo, and longer ,sharper siyahs. I have made a few of these bows  with bamboo floor boards that do OK over all. Simple, and efficient  design to make for beginning bow builders while their wood is seasoning etc.