I have a 1982 66 passenger Thomas and like Eric's, the width is the same with the same seat mount ridges as his. My useable floor length front to back is 28' 6". My wheel wells start exactly 9" from the rear bulkhead and run 3' 6" forward and 2' wide.
I've looked at motor homes in times past and agree that they aren't worth the low grade materials and worksmanship they're made of. I LOVE my skoolie! I also think skoolies have more personality than the motor homes. I mean, when I see a land yacht cruising down the road, I generally don't give it a second thought (unless the paint job is spiffy), but I don't care what bus goes by, I just have to take a second look at it!
~(G)Q Arduously Avoiding Assimilation