Hi Dave,
Not a lot out there, I think this is what you want, sorry if it's not. Most of the pics I found are of actual scale models funnily enough! So the sleeper pod seems to sit across the back of the cab where the standard rear side windows should be.
This AMT static model should be cheap and make a great reference if you can find one somewhere:
Looks like they made for quite a popular fire truck in the past!
Check out this link, small scale static models, but there are a lot of C900's in there built for different tasks.
http://rustycab.proboards.com/index....nt&thread=7398
Hope that helped some.
Steve.