were actually going to base the track on a 1/10 scale formula 1 track (yes, my cousins yard is pretty big) and we were thinking about concrete to but its gonna be some work. its not only going to be a flat surface but its going to have small uphills and down hills. so we need all the help we can get. i estamated that the whole thing would be done in about 6 months. there are only 3 of us who's gonna be working on this project, so i hope it turns out good. he wants all the banners and all those sponser posters and everything. pit stop garages, the works....i think he's crazy!