It would be cool if you could buy kits as it would be the next type of challenge for a lot of guys but there would be licensing issues which hand brakes this sort of thing.
Even the Kings of Diamonds is licensed, and sadly made in China with the first 100 going back to the USA to be checked and tweaked and then sent out to customers with the the next batch despatched straight from China to the various destinations.
Here is a good resource for fathom
http://www.pinball.yoo-design.com/
