This is a slight modification the the Modular Hex Display made specifically for the smaller Carrera GO style slot cars.   Specifically this design is 20% larger in length and width.   I made modifications so the car will sit flat on the shelf with the guide slots carved into both of the case designs.  I've also added a case design with a “shelf” that will allow for odd sized (like my Tow Mater) slot cars as well as provide visual interest.   Also included is a simple shelf you can glue onto either of the case designs after the fact.