The toy was purchased to be a joint project with a very mechanically inclined five year old boy. The product had no written instructions and very minimal diagrams. When constructing the large ferris wheel, it was very frustrating when it was not possible to duplicate both distal portinons of the wheels; and one of the wheels had to be fastened in one level. Better instructions including a written description of the construction steps on the larger projects would be a real plus.Erector Motorized Ferris Wheel Set, 477 Pieces