I took it for a drive this evening to a buddy's house, just under 2 miles each way. It cruises nicely, I'd guess I was going over 30 mph in a few spots - I paced some cars from a distance, hanging back so they wouldn't notice me too much. My daughter (13) wants to ride it, so I definitely will be fiddling with the throttle limiter to keep the speed down.
Thanks for all the feedback - I'm stoked about how it turned out. A lot of the ideas for how to do the fabrication came from the projects here, and when I had questions I got some good tips from members directly.