the idea is good, the toy could not be tested with the solar cell as the winter sun is too feverish, he just walk with a battery (rechargeable battery with solar cell). By against too much hollowing out little plan to read and understand even for a regular Legos and Mécanos plans. The engine is feeble and greedy. Goodies: good manufacturing parts and durable. Personally I'll stick by a solar cell on a lego and shoed the case for large time of creation and keep the idea that our great little star to us full of energy.
