Just stumbled on the KOTM videos on YouTube a week ago and absolutely love them. I have been a gravity race car fan my whole life and now that I have a 10 year old boy we have been at it for some time. When he was 3 for his birthday I made 7-12’ race tracks out of 1x6 boards with plywood strip sides for a total of 84’. The kids really loved it and all had such a good time that there were 2 paths of beat down, running paths through the grass on each side from the kids running down the track with the cars. It was used a couple times through the years but most pieces were sitting outside if the back yard.