Alistair, 

I have experienced a stroke of genius! I am going to make the world’s first Car-With A-Basement. Don’t think double-decker bus; think minivan with a flight of stairs in the back  leading to an underground multipurpose room. Any ideas on how to actually make this work physically? 

Inspired in Fort Erie 

Inspired, 

Too late, it’s already a thing. Granted, there are some loopholes to work out – putting the lower level into another dimension means it tends to get infested with unspeakable horrors, which requires constant cleaning. If you can work around that, you’ll revolutionize the car basement. My money is on a solution involving kale. 

Alistair