A Magyar is a better solution for your stave. Aim for something like 120cm ntn, 150° reflex in the grip with a smooth and large radius. You can use bone plates for the scarfjoint in the grip. The ears around +24cm from apex to the nock, limb to ear angle 140°. Don't use horn plates for the ears, they look silly and don't add alot stiffness, all they do is add more weight and create more trouble.
The ears can either be V-spliced or you can use a scarf joint. If you use a scarf joint, sideplates might be necessary. Antler is the best material for that, but it can be hard to find good pieces. Bone from horse ribs is possible too, but it's pretty messy to process the stuff. If you use plates, note that those were around 0.3mm thick on the originals. The cross-section of the ears was triangular.
Plates add quite alot of weight and it can be a pain to glue on, so if you don't make a heavy bow, it's not worth the trouble. Better make a short V-splice and triangular cross-section ears.
As recommended for a beginner, use even thickness for horn and wood in the limb, 4.5-5mm will be good at that lenght. Expect around 70-80g sinew for a 50-70# bow. You can add 10g on top of that if you feel insecure, for the wrapping of grip and end of the horn you don't need much.
