See the original kickstarter project here: http://www.kickstarter.com/projects/neolucida/neolucida-a-portable-camera-lucida-for-the-21st-ce

The camera lucida is a key component behind David Hockney's book Secret Knowledge: Rediscovering the Lost Techniques of the Old Masters see also:

Vermeer’s Secret Tool: Testing Whether The Artist Used Mirrors and Lenses https://news.ycombinator.com/item?id=6823528

Later on, once costs are covered, the makers are intending on releasing the plans and info under an open source hardware license..

--Does anybody know of any other open source hardware success stories? Please post info here.

Thanks,

Todd