I'm finding it a bit difficult to see from that photo how the antlers are supposed to fit (nice work, BTW

) but assuming the antlers are each separate, here's what I would do...
... drill a small hole with a Dremel-type tool into the head of the deer where the antlers will be affixed. Snip off the end of a veneer pin and epoxy it in the hole with the sharp end of the pin sticking up towards the antler. Press the antler onto the pin then remove it, enlarging the prick with the Dremel drill. Apply epoxy to the antler and press it into position.
It sounds convoluted but in practice it's quick and provides a very strong bond (especially if you use a five minute epoxy).
Gill
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