I hope you are getting on well with your Explorer. Just to let you know, you can now purchase an Inventor's Kit through www.project-laika.com:
Individual boards can be purchased from Kitronik, Proto-pic and Technobots- please see website for details.
It would be amazing if you could spread the word as I am eager to move on to producing some exciting add-on modules for this design but funds are a little low. I hope to put together a new Kickstarter next year to help things along.
Many thanks for your support,