I've built a crossbow using cow bone, fallow antler and water buffalo horn, all processed from scratch. Antler has a nasty tendency to return to its original shape unless cut very thin and though a splash of acetic acid helps lock in any new shape, it never seems to last and can be damaging to the antler. Good to know elk antler won't be long enough, saves a fruitless search. I think corset boning won't be long enough or wide enough?
I will check out Rothko and Frost.
The Asian hornbows did (do) use horn on the belly and tendon on the back and stretched from Egypt right across India, Korea, the Mongol Empire and China and everywhere in between in a bewildering range of shapes and sizes. They've been documented across thousands of years in ancient Egypt, Scythia, Persia and on and on.
Ram horn is on my bucket list of materials to work with, could be fun to get hold of some but for the inlays, I'm afraid its going to be too short and maybe not white enough?