I have an entry. I reckon 11 points (+0 stock, +8 indefinite loop, +1 for 1 Kerbal, +2 for 1 cart, +0 for some part clipping). I did get a bit stuck on the fourth time around the track, but it can otherwise operate pretty indefinitely (I gave it no steering or throttle input until it got stuck).
Can we have a leaderboard, OP?