Yeah, good stuff - but I'm not sure about how practical the needle is. The wide bit that the eye passes through isn't going to go neatly through the hole made by the point.
When I've made antler needles, what I've done is to score out a blank between about 2 and 4mm wide from the side of a round piece of antler, then split it off from the core. Then scrape / file it down to the right size and shape. Putting the eye is is the tricky bit - I generally file the eye end down so that I've got two flat sides, locate the eye by twisting in the point of a knife, and then very carefully open it up by scraping. The smallest needle I've made this way has a diameter of about 1mm - certainly a lot more fragile than a modern steel needle, but surprisingly robust nonetheless.