I need to see that. I had to resist the urge to meddle with my son’s construction of his car when he was a Cub.
That’s why I always advocated an “open” race after the official derby.
That allowed the dads to build and race their own cars. Helped to cut down on dad built cars for the Cub races.
We have open class races too, my daughter loves them, all my kids race in the open class.