I sent some billets to a guy in Germany several years ago and he tried it with a sinew backing but the
drying sinew pulled the sapwood up away from the heartwood. He then decrowned it and backed with bamboo,
said it was one of the best combos he had ever used.
I wish I knew the details but it's been too long to remember- I know he made a flatbow but have no idea of the
length, width........wish I was more help.