Ron Onrust, in Germany, spent 5 years converting a double-decker bus into an awesome camper. He’s put together a video to show the highlights, and a website for the details:

There are lots of great ideas in here, well worth taking a look.

https://sites.google.com/site/bigbuszz/

(Here’s the Google Translate-d version: https://translate.google.com/translate?sl=auto&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Fsites.google.com%2Fsite%2Fbigbuszz%2F&edit-text=)