My frame number is M30IA0479.
My Eldridge is originally from Italy. So maybe you're right on your paint conclusion, but i saw a white one on ebay.de but that means nothing..that one could be from anywhere.
I also have a Marin Muirwoods with the same coloring like my Eldridge plus some green extra splatter. This bike is from the UK.
The frame number on the Muirwoods is M60IA1000.
So maybe it was all about how cool some importers found a special color.
Your green Marin must be the fastest Eldridge of them all because it has no breakes
So what bits are you thinking about to install to finish it?