I believe that this was an after school special, from the mid 80’s or so…at least that’s about when I remember seeing it. It features an older man who has build either one tower, or a pair of towers, completely from stuff found in a junkyard. This young boy becomes interested in the process and sort of apprentices himself to the man, learning the difference between “good junk” and “bad junk” (I swear I remember that as a quote), and eventually the city sends someone out to destroy the towers, which were assumed to be a physical hazard.
The city guy has a pickup truck, climbs partway up one tower, or maybe to the top, I’m not sure, and hooks off a winch cable to it. Then he tries to drive forward and yank down the tower, but the thing almost magically won’t budge. Not even a shudder. The truck peels out and just can’t do anything to it, so I guess they let the tower stand.