Now one of my mistakes: oleos of front legs are to long (I have overlooked that the main legs are partly hidden in the fuselage). The suspensions of front wheels on the wrong side... arghhhhh!
3 work hours later... Front oleos have made shorter, support struts have made shorter. Heli's back: ok, heli's front: ok, heli's angle: ok, angle of front struts: ok (thanks Felix!!!). Now coffee time!