This is one of the most enjoyable things I&#x27;ve ever seen on HN. It&#x27;s just ... <i>fun.</i><p>I remember doing PWD with my dad when I was a kid, shaving #2 pencil cores to get graphite for the axles, making a batmobile one year, and generally doing things that probably had no influence on making the car faster, but that involved  a lot of Time In The Shop Experimenting.  PWD is the kind of thing that makes hackers out of impressionable youngsters.