The Ratster runs, here is proof:
And yes, it sounds like a tractor in this video. It sounds way better in person, especially when I rev it. Not to loud though, but a nice gruffy bark.
I hooked up the fuel line, tightened a few hose clamps, kicked it over a few times, and kapow. It ran. I think the idle speed is a bit low, but it ran great with a tick of choke. It also revved fairly clean, although I wasn't revving it that high. I figure it needs a few gentle runs up and down the street to break in. I still need to sort the rear exhaust bracket, wire in a on/off switch, and generally make sure all the bolts are tight and shit won't fall off.