I would probably going to use flex track to achieve the same result. Shapeway charges an arm and a leg for a daisy shell. It will be extremely expensive.
My Trackmaster/Tomy/Plarail Photo Gallery Page (over 600+ photos and still under construction)
https://www.flickr.com/photos/183311600@N03/
https://www.flickr.com/photos/183311600@N03/