I received this yesterday. In some ways, the craftsmanship is even more impressive than my Willits. There is a lot more handwork in making this than a Willits, yet the end result is every bit as "polished".
There is an DVD copy of a VHS tape that shows Walter building one. It is of pretty poor quality, but shows most of the steps. I don't know where it can be found, an I have forgotten where I got mine.