This airplane is also known as the AMA Cub and the Delta Dart.
It is easily built by Cubs and Scouts, though Scouts could also do the more challening Minnow. Constructions should be spread across two to three meetings.
Note that there is now a more suitable model available for Cubs called the Squirrel.
A set of good building tips is well worth reading.
This kit can be purchased from Great Hobbies.
Other rubber powered airplanes are available from Midwest Products.
There is also a set of flashy instructions available.