Well, here's my first attempt with sinew and I have to say that I aim to be doing a lot more.
The bow is Osage Orange backed with sinew and baby Burmese Python. At the moment it is shoot off the hand, with the handle wrapped with buckskin. Shooting right around the 155-160fps marker at 55#@28". The bow is 54"T2T and 52"N2N, kinda a mollegabet hybrid with static tips with a very slight natural recurve, which is good because it did take some set (or as I have heard some other bowyers say: "It settled in a little bit"). I absolutely love the smoothness of this bow and am feeling really good about the world of sinew after this first attempt/success.