When a store window full of colourful novelty kites gets the cubs excited about entering a kite-flying contest, Brother and Sister are surprised when Papa suggests they build their own kite instead of buying one.
When Brother and his pals decide they're going to join forces and build a car for the upcoming go cart race, Cousin Fred puts himself in charge of designing the car, Too Tall puts himself in charge of getting the parts, and Brother puts himself in charge of building it.
When Too Tall and the gang decide they're going to build 'a most excellent' tree fort in a big old tree in Birder's Wood, Brother, Sister and their pals try to convince the gang otherwise in order to protect a rare bird nesting in the same tree.
Papa and the cubs each have a problem. No matter what he tries, Papa can't remove an old tree stump that's obstructing his view of his garden. No matter what Brother and Sister try, the scarecrow they're building for Papa's garden actually attracts the birds instead of scaring them away.