Actually it is quite difficult which kit could be used as the base for creating the G-6/AS kite without buying conversion parts. There were G-6/AS with low tail or with the taller one either the metal or wooden ones. Also the engine cowling could be of a slightly different shape. Anyway, a pic of a quite good quality would be useful for a such work.
If I would make models of 1:32 scale I used the Hasegawa 08198 Messerschmitt Bf109G-14/AS 'JG300' kit as the first on the list or the Trumpeter 02298 Messerschmitt Bf 109G-10 as the second one.
Same time ago I found the diagram via the net ...
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the pic source: the net.