So, it seems we have some quality issues at Scalextric. Bummer. The car is really nice, and now that I've fixed the guide, re-soldered the wire, and flipped the bumper, it is just about perfect.
I'm wondering if this is a new chassis mold. Has anyone else noticed a rough texture to the plastic on the front lower valance that is part of the chassis? On every other Mustang, this are is painted. This is not painted and I notice a pebble like texture similar to the bottom of the chassis. It is possible they have changed something or remolded the chassis and made a spec change. The guide issue could simply be the mold was goofed up in that area.