Once again thank you all very much.
@ Michael C.: Yes, you are right - I was wondering myself if I want to wrap the handle, but for me it is more comfortable.
@ the Hornbeam-Belly starts with 10mm at the fade outs and ends with 6mm at the tips. But you have to add 0 to 4mm from the wedges at the last 21cm.
By the way - the Bamboo-Backing starts with 4mm at the middle of the bow to 1,5mm at the tips.