It was in the plans back in the late 1970s/early 1980s. You can see it popular science of the past, along with a lot of other parts to the total shuttle system, very little of which was ever built. The basic idea is you can put lots of things in the cargo bay, parts to a space station (not the ISS, though the shuttle was used to build the ISS), a rocket to get from low earth orbit to something else, a bus for lots of people.
I wonder how much was a serious proposal, and how much was an artist allowed to daydream.
I had not heard of this 80-person shuttle-bus, that sounds pretty crazy!