My kids helped me paint G-Force and add some black duct tape lines. For a $3 paint job it's turned out better than I expected.
The single ping sensor wasn't cutting it for avoiding obstacles so I added two more. Obstacle avoidance is basically working now but I haven't really been able to test it at the same time as the navigation. I'll have the chance to test everything out on the actual course this Friday afternoon and the event is on Saturday. Here's a video showing a test of the obstacle avoidance: