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Awesome design. Such a simple concept. I read through the website you linked and I'm very surprised more printers don't do this.
I was thinking about it, and I think you may be able to simplify the design a bit actually.

  1. You don't really need magnets on the ends for the parking position, because it doesnt matter too much that it is held rigid. The unused carriage can just sit there.
  2. The hotend holding carriages don't need linear bushings/bearings, because that will be handled by the moving carriage. You just need to design in some features that register the position when the carriages attach.