Ohma2, Delta_wolf, PatB, Hawkdancer - thanks for your kind words guys.
Building next bow using this backing I will document the whole process and I will gladly share it with all interested.
Speaking of the tiller I partly agree that it could bend a little more near handle section but wasn't sure about it- handle is a bit deflexed towards to both limbs and it's still bending there.
I am from Poland, Europe.