Originally some scout airplanes were attached to every FFA/AFA to defend the unit. In 1916 these fighters were regrouped into bigger temporary units to defend the German frontline more effectively against the special scout squadrons like 24th Squadron or N3 for instance (until then the just one or two German scouts of the FFA/AFA had to face a whole Allied squadron of fighter scouts). members of such a kek - Kampfeinsitzerkommando = fighter scout detachment - were still linked to their original FFA/AFA. Kek Habsheim (not "Habstein") was founded in March 1916 with personnel mainly from FFA 68 and some men of FFA 48. The scouts they flew were Fokker E. III and D II, later D III. on September 28 1916 Jasta 15, a permanent unit, was founded with the personnel of kek Habsheim and more personnel of both mentioned FFAs.
I actually understand your intention to model several airplanes that were flown by these units or by Udet himself. As far as I can say, this is a hard task. If I were you would browse through the Windsock volumes of the then used reconnaissance biplanes (Albatros C I, C III, B II, LVG C II, AVIATIK C I, ALBATROS C V, RUMPLER C I) and hope that you find a pic of FFA 48 or 68 somewhere (the volumes of Jack Herris are valuable here too). As far as I know there's no special book dealing with these units.
German sources about FFAs/AFAs are sadly quite rare due to the fact that the archive of the imperial German army burned to the ground in 1945.
I hope, that helps a bit.
Best wishes
Borsos
