This is the popular advanced trainer that was sold by Great Planes. Span is 59 inches. It is similar to the RCM Trainer Jr. Both planes have a thick symmetrical airfoil and are essentially a high wing version of the Kaos with constant chord wing. The major difference is that the RCM version has a single elevator, but the Great Planes version has split elevators. Because of this detail, the Great Planes version is easier to convert to tail wheel configuration.
Download the Great Planes Trainer 40 kit plan, not the later redrawn CAD plan, which has inaccurate dimensions.