That is pretty neat! I have 3 grandsons and over the past 2 years have been fortunate enough to build box calls, from kits, with all 3 of them. They have not yet gotten into the Pinewood Derby races but I well remember helping to build those cars with my sons and then just a few years ago with a crop of RAs at church. Good fun.
"If he's out of range, it just means that he has another day and so do you."