As this thread is over a year old, and Kurt has recently left the hobby; I doubt you'll get an answer. But to let you know, he scratch built the East body.
Illini Replicas makes a 1960 Kenworth 900 Series (similar to the one shown above). They also make a 1955 & a 1959 500/800 Series. http://apps.aitruckmodels.com/Gallery/album.cfm?a=8735
That's pretty cool. I'll have to check out their site. When I first saw these photos, I thought Southern California. Not sure why, but that's what I thought.