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A guy in the Singapore section did it. He converted to a R3 front end but used series I headlights. Not cheap.
The only pic I could find but I believe he finished it and is even running R3 wheels.
This one looks great, but the lines are still a little funky around the side marker. The S1 and S2 are just too different right in that area. To really do it right you would have to do the fenders and lights too.