That is indeed referred to as American Hornbeam, muscle wood, iron wood, and so as not to confuse it with Hop Horn beam I just call it blue beech. You can de crown it, and sinew back it. I have built quite a few bows from it over the years. You can leave the back as it is in your pics, and get a bow out of it, but I never had luck with it done that way. I have also de crowned it , and backed it with linen. I have also filled the low spots on the back with sinew, and then sinew backed the whole back with a thin layer of sinew which worked really well. I found it to be flexible enough to make horse bows from it. Takes heat well, and you can recurve with dry heat. My best to date bow made from blue beech is a 60 inch sinew backed recurve. 40 lbs at 25 inch draw. Smooth drawing , and snappy. It is not a real popular wood for bow making ,but it can make a good bow. I made most of mine out of saplings. An ax works better than a draw knife to remove heavy wood, and then use different rasps , and sand paper.