Turned out pretty well for a first try. Wheels are spruce and douglas
fir, with ash hubs, rest is poplar, axles are black gas pipe, box is 4
feet long. Up close there's a lot of room for improvement, but from 10
feet away it looks pretty good IMO.

http://www.flickr.com/photos/39383723@N00/4964837813/

Thanks for all the help and advice.