Do you have a taxidermist lined up at "home?" If so talk to him and find out how he likes his capes.
Talk to him about velvet preservation. There are a few methods out there and depending on how much time you have between your hunt and when you get back to town willl determine the best method. IMO, sometimes velvet can't be saved if they're close to stripping it. I got lucky a few years back and took a nice bull. I ended up dropping it off at a place that does freeze drying (Fox Taxidermy in Wasilla) The temps were cold, and I worked out as much blood as I could from the velvet. I think I dropped it off 4 days after I shot it. The antlers had to be cut off to put in his freezer. I put them back on a skull and it turned out great.

I killed a bull last year that was half stripped and half in velvet. Once you peel the velvet the antlers are really white and pours. I suggest leaving it on for a while before stripping it. The blood will give them some color, and then stain them with mud and pine pitch from bows. My bull turned out really nice and dark. Ask a taxidermist about this, as this was my first attempt at leaving velvet/blood on antlers. I might have got lucky.
Sorry, no after pic... but the antlers are dark chocolate brown and look pretty natural. I could polish them up a bit more and get the right sheen, but there good enough for me. The top of the white antler was hard to color, as the velvet was stripped by the bull prior to me shooting him, and it was raining so the blood was washed off. I stripped the rest of the velvet on that antler, it looks pink... it turned brown after a couple weeks. The other antler I stripped the next day, it was redish brown as well after being bright red.
For the cape, at a minimum learn how to flesh and turn lips/eyes/nose/ears and salt it. If it salted you can bring it home with you on the plane, otherwise leave it with D&C to finish drying along with your antlers. They also offer fleshing/salting for a nominal fee. I suggest you let them do it if you are only a couple days from the time the animal is dead to its salted. If its cool the cape will be fine for a few days, keep it dry... If you're going to be more than say 3-4 days from getting it to them or to a freezer, or its warm, flesh and salt that puppy.
Good luck on your hunt!