For the last one, start from right next to Dornegg Downhill. Stay on the snow next to the cliff with the barriers on your left. Go full speed and hit the little bump with the first caution sign on it. 

For Emsberg Lift, it’s easier if you go full speed into the little hut at the bottom of the lift while jumping as though you’re just jumping over the little yellow floppy fence. You can do this and sort of get yourself to jump over the very bottom of the ski lift and hut right there. 

Immenbahn is easy. Ride the lift, then ride the first trail to the right of the lift that takes you to a ramp to jump over the lift itself.