You have great advice here from everyone.
I will simply reinforce the fact that you MUST, MUST, MUST know exactly how you're getting your meat to the butcher, how long it will take the butcher, can they vacuum seal, can they flash freeze, can the butcher box/crate/insulate the frozen meat, can the butcher arrange shipping. If the butcher is not able to crate/box/insulate, then get references from them for someone that does it and get that fully locked down. If the butcher does not ship, how will the meat get to the shipping company? Can the shipper keep it frozen before shipping? Also know how your rack is getting to the taxidermist, cost for Euro, cost to cut the rack, cost to crate, cost to ship. Consider that it may not cost too much more to have the entire rack shipped un-cut. Check cost differential on that. Be certain that whoever crates your skull has it absolutely locked/strapped down securely so it won't come loose and get smashed in transit.
Get Names/addresses/phone #s, email from all the above service providers, also their operating days/hours and after hours phone numbers, cell #s. Program all this into your phone before you leave.
Get all of the above done and written into a PLAN with phone numbers BEFORE you head out. Get your shipping method, and costs for each step completely settled. Prepare to be stunned at the cost. Not surprised. STUNNED.
If you wait to do any single step of the above until you're there or have a moose on the ground, then you will be completely f'd with no one to blame but you, because you simply won't have time to deal with getting all the steps locked down. You may not be able to quickly reach the people you need to reach because they're busy or it's 10om at night, or they may not be able to reach you because of any number of reasons. You won't have time to shop for pricing, etc.
You got good advice to check with other guides. I agree with that. Build your check list from my first paragraph and pick their brains on how they get it done. If you're having problems building a list of service providers, try call the local hunting supply stores, they can be a wealth of knowledge.
I shipped my full rack (uncut) and salted cape in one LARGE plywood crate from the Yukon to Vancouver, picked it up there and drove it home. It was STUNNINGLY expensive for crating/shipping. Find a registered/known shipper to help you ship your meat. Check with the local butcher.
I would say Best of Luck, but this time I'll say-- Get Going on the Planning, because Prior Planning Prevents Poor Performance.
JL