My GoKart project is not dead. I actually just finished optimizing the Kart model, the driver model and the environment for mobile purposes. Want to be able to port this to the Android and iOS devices, tablets, etc. I just got a hold of NGUI some time back and am in process of converting existing GUI code, and assets to an NGUI based GUI. I am nearly ready to implement AI into this track. The visual elements on the wall (signage, banners) are all stand-in, will replace with some realistic looking signage/banners. Also the UI will be redone and is stand-in as well.
Link to a temporary webplayer:
Unity Web Player | WebPlayer