Though I disagree with your point of view, I am sure we will all be impressed by your attempt and interpretation of the wing details. The crosses I used were fine and especially on the ailerons and their cut outs tend to wrap slightly. Some good references might help with your future questions.
References:
Eisernes Kreuz und Balkan Kreuz by H.Nowarra, Hoffman Pub. p.120, 1968.
German Army Air Service in WWI, Osprey, Vintage Warbirds #2, Photos 102-105, 1985.
German Fighter Units - June 1917-1918 by A.Imrie, Osprey Pub. 1978.
Jagdgeschwader Nr II Geschwader 'Berthold' (Aviation Elite Units) by Greg VanWyngarden, Osprey Pub. 2005.
Lafayette Foundation Archive, Denver CO. USA.
Over the Front Vol. 2, #4, p.376, 1986.
Over the Front Vol.14, #3, p.280 1999.
Over the Front Vol.14, #4, p.368-370, 1999.
Over the Front Vol.15, #4, p.370, 2000.
Pictorial History of the German Army Air Service by A.Imrie, Ian Allan Pub. p.173, 1971.
Siemens Schuckert Aircraft of WWI by Jack Herris, Aeronaut Pub. 2014.
Siemens Schuckert D.I/ III/ IV by Harry Woodman, Scale Models, Pp.348-352, July 1981.
Siemens Schuckert D.III & IV by P.L.Gray, Profile Pub. #86, 1966.
Spandau Machine Gun by David Watts, 1998 WWI Aero.
SSW D.III by Dick Bennett, WWI Aero #123, Feb. 1989.Pp.8-25.
SSW D.III Cockpits & Instruments by Roy Meyers, WWI Aero #123, Feb. 1989, Pp.72-75.
SSW D.III - D.IV by P.M.Grosz, Albatros Pub. Ltd. Windsock Datafile #29, 1991 & 98.