[MrFlippant]

It would be simple to rejigger the existing shelves for three or two cars in the aforementioned orientations. Along with an optional pair of "stilts" for one shelf, you could take up three shelf spaces to have two car trays with enough vertical space for most cars, leaving one space for a parts bin, and the top for your controller. With some good measurements, I'm sure the front panel filler work surface could also be adapted for that smaller box. Those with the skills can certainly have at it, but I'm also happy to lend a hand with that if needed.