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What if you could somehow make modular tower kits.
I was thinkin'... If Shapeways isn't the right route for the actual structural components for catenary, what about just offering the caps, bases, and insulators? Then we can use our own soldered brass shapes for the poles and K bridges.
@Lemosteam , I'm sure you've seen this page http://prr.railfan.net/standards/. All sorts of goodies there, some of the signs could be useful.