There is a guy in the Netherlands that has done it on a 3L it is possible his process is here
Bildergalerie vom Umbau:
Nach dem Umbau des Serien Audi A2 Open Sky Glasdachs in meinen A2 1.2 TDI 3L (der von Audi nicht mit Open Sky Dach lieferbar war), besitze ich nun das weltweit einzige Exemplar mit Open Sky Glasdach.www.tim-d.de
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An OEM standard conversion, but he did say he would never convert another!!It was also a 3L, belonging to @Phoenix who came over from Germany, that I saw with this mod at AITP last year. None of the 3L's had OSS when originally built, due to weight-saving considerations.
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