Lil' Hal's Giant Christmas Box

The back story about "Lil Hal's Giant Christmas Box" goes like this. . .

Hal's uncle Clarence had a car repair shop. Hal really loved to watch his uncle at work. But for weeks he was kept away so Hal won't see his uncle's very special project. Clarence had acquired a used race car that needed repairs. The car had a Delco light plant for a motor and used airplane landing tires.

In the meantime, to distract Lil Hal's curiosity, a big box weighted with bricks was wrapped and placed in the attic....