You have to start with a base vehicle and then customize
Conversion vans used to be a fairly common sight on American roadways in the 1980s and 90s. Now, you don't really see many of them owned by the average consumer. If you do, it's typically a survivor from the conversion van heyday. Despite this, these vans do still exist. It's just they're not as needed thanks to all the modern amenities that come in minivans these days. Still, if you wanted to outfit a van to your liking, you could.