Albert,
I did a musk ox hunt on Victoria Island, NWT, Canada for around $6000, when it was all said and done. The adventure of getting to the island was as much fun as the hunt itself. These beast's shaggy, sand filled, coats stop an arrow like a bag target. I would recommend a 3 to 1 ratio two blade broadhead for the best penetration, and a heavier arrow if possible from your 70 pound bow.
A life size mount is a great way to capture the uniqueness of this animal. I did the work on mine myself. It cost $800 for tanning and another $800 for the form. Add another $50 for eyes and incidentals. It took me two days to stitch him up...
I had this one come up behind me while hunting Caribou on the "Sag" in Alaska.
This is the one I took on Victoria Island
