I'm always in the same situation. My buddies are too damn lazy to help build anything.. So I always end up making them myself. I've realized two things. If you want to spin off it, make it a flatter lip, and put it before a roller: making it just big enough to clear the lip of the roller. Knuckling sucks especially if it's on your own hit. If you want a jump for bigger air and grabs and that sort of stuff. Put it right on the tip of the roller, but make sure there's enough slope for a comfortable landing. When you make the jump for spinning, you really don't need it packed down that much cause you should be spinning while your in the air. Start with a rectangle base (I usually make it as wide as my skis) and as long as a snowboard (if you have a snowboarder friend). And then go to the side of the trail, where the edge of the groomed trail is.. And that's where you'll find ice chunks. Ski boots, snowboards, and skis work well.. Cut ones as big as you can and pile them on your base in the general shape of the jump. Then throw an excessive amount of loose snow on top and ITL drain into the cracks between the ice pieces, forming a nice smooth surface. Woahlal!!! 30 minutes later you have a nice hit worthy jump. Same principle with the kicker just make the base about as wide as your skis spread apart wide. And a steeper incline. Water helps, but it's pretty easy without it.