An Elk is just a big Deer. In the past we've gutted,skinned and butchered just like we would a Deer. It just takes a little longer. I wouldn't be too concerned with having too much Elk to eat. It's some of the best venison around,and is usually eaten pretty fast. Unless you shoot a Big bull or a huge cow,you won't have that much meat anyways. Say you shoot a spike thats about 300 lbs.

start with 300lbs,subtract

50lbs guts
50lbs hide
25lbs head and horns
50lbs bones

You're left with about 125lbs of meat,that's not much to have to eat in a year. Thats like a 1/3 of a lb per day,who eats 4 oz. oz meat ea. day? Heck,if it comes down to it just start the Atkins diet. Then all you'll eat is meat.