If this bow comes out half as nice as your recent osage holmegard, it will be a beautiful weapon.
I assume you looked at the earlier Viking bow thread - I posted a link to some data on the bows, but I suspect you have seen that. JD Tiller was planning to build a Norse bow, as well. I don't know how he is getting along with it, though.
One out of the group was elm, if memory serves me right, and these were all made from branches or saplings.
And cool on the spike - that will really add to the bow. Good luck on this!
Dane