We ran across this on Boing Boing yesterday and spent way too much of the day watching the four-part videos. As most of you are aware, owning, building, or even just experiencing a tank is high on Seans list of things-to-do-before-he-dies. So he wants to jump on this right away.
Anyway, this is a really great watch, and all the videos are available via YouTube. The first is embedded above, but here are links to all four: