So I see these double deckers more and more here in the states for transporting people. However it gave me a great idea for a bus conversion. The lower section is very low so you basically loose most of the basement storage and not sure about headroom.
But I thought how cool would it be to leave the bottom floor right around 6'6" and then have a upper floor that could be raised like some of those low profile travel trailers that were sort of like a pop up but had hard upper shells.
Get to your destination then raise the roof and have two floors and slide outs for the bottom to give one huge living space.
Someone with a lot more money than me should do this.