Hi again,
I made a few sgian dubhs, antler pins and a closure for my sporran over the last few months. The best piece of advice I can give, is to wear a protective mask and goggles. Antler gives off a very fine dust that you really don't want to inhale. I try to work outside where it is well ventilated.
The search feature will bring up a few good threads that might be helpful too.
I can't wait to see what you come up with, I am sure it will be cool!
Sara