I'd say make one or two really nice big kickers rather than a whole lot of different sized ones. That way there will be less maintenance.
If you're building stuff in the dirt, just build a big flat section into the hill to build the kicker on once the snow falls. Check out the picture: green = hill; brown = what you need to build with dirt; blue = kicker with snow. Try to get use of a groomer when you build the actual snow kicker and it should be pretty easy.