Thanks for sharing the article. I've never biked the velodrome. It sounds fun, but you need to have a fixed gear bike and I've never gotten around to doing that. I've ridden a fixed gear bike - it was a blast. I think you can put something together for under $200...maybe something to try.
The article is also fun because I know most of the people. Bill Anderson grew up on the next street from me and was maybe a year or two ahead of me in school. We played basketball at his garage a lot. Mark Thomas was an orienteer back in the 1980s - a good guy and his business sponsored OK O' suits for a year or two. Steve Schwada and his father are involved in development in Lawrence and I met them when I worked for the City. I don't know Ashton L, but I think I dealt with him when I was getting a bike repair and he worked at Sunflower.
What's the orienteering equivalent of a grass velodrome?
If you want parts, I have an ancient track bike in my basement. I also have a singlespeed cyclocross bike which could be easily converted to fixed gear. Wouldn’t even need to get rid of the brakes since they are disc, so they wouldn’t do anything without rotors on the wheels.
Perhaps the O equivalent of something completely different, unexpected and super-fun would be navigating in an underground maze.