Bill,
Looking good my man, real good. It's going to be a pride and joy of yours, and most likely won't be the last you make!
It is ok for the antler to have that curve to it.
Just as long as there are NO voids , some gap is OK. If, after epoxying there is a gap, fill it with superglue. Insidious water will get in if not, and ruin your hard work.
I would smooth over the shoulders now, as opposed to later. Actually, next time I would do it before cutting the antler, then it is symetrical with minimal fuss.
I'd wet form it on something other than the gaurd... but I haven't tackled a AG knife
Good luck!
Mike