I have made a bow from american hornbeam. I also call it muscelwood.
#1. Remove bark asap with it,because of the undulations along the bows back. Its a pain to try and scrape that off when its been cemented to the stave.
#2. Id seal the back to be safe.
#3. Once dry,make a bow and follow that muscley grain. Its a tough resilient wood for sure and will make you a fine character laden bow.
Use the same dimensions as you wood for hophornbeam,dense maple,or hickory and you'll be good to go. No need to back it. Although id like to sinew back one sometime in the future.
I have photos of mine if you wood like to see it. Let me know. Id be glad to post em for ya