I really like this one
Jake's School Bus Conversion Project
But like Gappy I'm more into the minimalistic approach.
I'd like the bunks to fold out of the way, I'd like to have a good usable kitchen and bathroom, but I think there's ways of doing it all without actually trying to build a standard house inside a bus. I'd rather come at it from the perspective of living in a landcruiser (like I am now), only there's way more space!