I only heard of one of these creations and it belonged to Otmar - creator of the Zilla controller. Finding it had Oregon plates and a Biodiesel sticker confirmed my suspicion.
No sign of him on Saturday, but on Sunday, my dad flagged me down to talk with a guy wearing a goofy purple hat - it was Otmar. He asked how I liked my Zilla (which I love) and we talked for 15 or 20 minutes about the state of the conversion market and the different projects he's working on. I asked him to sign my Zilla