I remember being very interested in them back in the early 2010s, but progress has been very slow. They're more or less at the same point now as they were then, as far as I can tell, apart from minor updates. It's hard to be sure though because their site updates so rarely. I clicked through to it just now and there were some machine pages talking about what they hope to accomplish in 2014, and others being proud of their progress so far in 2018. It's hard to tell exactly where they're at when their site is so inconsistently updated.

If there's a source showing a clearer and more complete picture of their status I'd love to see it, as I do find the idea interesting.