I've toyed with that one for awhile. Too bad it can't easily be combined with musk ox, then you'd have something worth saving for! I think a walrus skull with the tusks hanging down is the prettiest skullmount of any trophy in the world. I was in nova scotia on a tourist boat and the captain was using a walrus skull to keep the cabin door propped open.
You're right about how the rifle looked. We got another photo from Mr. Matyas and you should get a clear look at his .375 in the newly posted photo at the same link.