I built this lawmower during the summer'15 and I was using only the parts from a set 42039. A few days ago I prepared a PDF photo sequence instruction. My lawnmower has: * attachable grassbox * two-speed gearbox connected to the front wheels; * ability of stopping of blades' rotation in case of an obstacle; * adjustable handle in two places. The video shows all that functions. Movie was prepared when I was unaware about rebrickable website, so more than half of it shows chosen building steps. Download the instruction, watch the movie and comment. Thanks.