I have had problems with musk ox in the past. Not, so much, cracking as shrinking. This was due to improper stabilization and using the musk ox too soon after receipt. It needs to cure, dry out and then, after one year (or better, be sent for stabilization! I have never "used" it so am not qualified to say as to how it would hold up.
Hope this helps, Capt. Chris
PS: None available, at this time, for any "builds"...CCS