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@Regal
Sugino seem to spec the RD2 chainline as 45mm...
http://www.suginoltd.co.jp/japan/single_piste_parts_list_japan.htm
Seems it might come from originally being a double chainset - from those pics it definitely allows for a ring on the inside of the spider. So I reckon you could just mount it on the inside as long as you have the chainstay clearance (which you should on a track bike like the Precursa). Maybe ideally you would need a 1 or 2 mm longer BB, but if your hub is giving 41mm it might be perfect.