Nice bow and the tiller looks good. I have made 3 bows with cherry bark and love the look. On my last 2 I left the lichens, etc on and sealed over that. On my first I removed all that down to the smooth coppery surface of the bark. Very cool stuff! Is your hornbeam the same genus as ours; Carpinus? It is commonly called muscle wood here because the trunks have a sinewy muscular look to them.