It'd be possible, you could have a number of set peices of road for you to mapa course from you coould change the tightness of a corner, the camber, elevation ect. All you'd need to do then is pick a type of scenery and then let the PS3 generate scenery around the track from a library of objects built n the game from other tracks like tree's grandsatands ect. They wouldn't be as realistic or look as good as the pre-done tracks, but it's hardly impossible. As for space, I refer you once again to the Blu-Ray disk, rember were not limited to DVD's now.