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41,
I've done several pronghorns like this. I use just a regular 3/4" drill bit and bore it into the braincase from the bottom. It's kinda hard to explain. For the sheaths, just put the skull in boiling water with the water just a couple inches above the base of the sheaths. They should slip off the skull after only 15-20 minutes of boiling. You'll have to then scrape out all the jelly like gunk inside the sheaths. Fill them with borax and leave them sit upside down for a couple weeks. Then do the whole skull like I explained earlier. After the sheaths have dried, reattach them to the skull protrusions with some caulk or silicone.
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