Got a reply from Fubar .. he said it`s to much work but read your self .. hope it`s ok to publish it vcause it`s not a PM with delicious text, just some informations.
Writing a tut on FM creation would require take a post spanning several pages. Understandably, it would take anywhere from a few days to several weeks just to put the data together (never-mind getting it down in a readable fashion). That's why no one has done so, to date.
A few modders who are new at this tried their hand at it (that is, creating a community FM project), with somewhat mixed results, as it takes months just to get a proper grasp of aerodynamics in-game, and years to become competent at it. So the community created model came off as being rather unrealistic.
I'll tell you what, though, start by getting accurate measurements (in meters) of the aircraft's wing root chord, wing tip chord, leading edge sweep angle, and total wing area. Do the same for the horizontal stabs.