wow. I remember seeing that back in '09 when I first stumbled on this idea of conversion rather than purchase. Of course, I was thinking about converting a bread truck at the time, but was doing a lot of research non-the-less, and spotted that site.
I did notice that after installing the deck on the bus, the roof in the back stays substantially cooler than the front of the bus. I still have to paint the roof with the solarflex, though, so hope that will change once I get "a-round-tuit".
I really, really like his idea better, though and still have ideas about doing it later.