We're looking to make a world-record-breaking hopscotch course this fall (mid-september) as part of an event focused on community engagement. Detroit needs to beat the 3.4 miles (5.51 km) record set in Ontario, Canada in last year. We're looking to lay down 3.7 miles (6km) of hopscotchin’ goodness, which raises a big problem in the logistics of the endeavor.We're thinking about building a bike-pulled chalk-spraying device to help paint a hopscotch course on the sidewalk. Basically this, but smaller. Or this, but bigger. Let me know what you think.--Dylan BoxDesign GuyWedge Detroit