I did my 9 year old a disservice on here with the whole Thinking Big post. His world may be small but he's always pushing the boundaries of it. He can be amazingly ambitious when he's enthused about something. To illustrate, his current excitement revolves around these 2 pieces of wood and a half bald bit of sandpaper.
Because when he's collected some more bits of wood and confirmed the dates he would like to borrow K's screwdrivers, he's going to build one of these in the back garden.