Think I may have found a solution to the low-profile vocational White COE.
It looks like White used the same cab as their conventional day cab:
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The side profile matches the COE nicely. Reusing basic construction assemblies makes sense in trucks and has been done in the past. The International Sightliner was literally a conventional cab assembly mounted over the engine and added windows where the firewall would normally be.
In fact, the same doors are used on White's full size COE:
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But the cab on these looks far too wide:
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Here is another angle of the same type of cab on another Conrail vehicle:
http://crcyc.railfan.net/mow/vehicles/fueltruck.jpgI think White used the basic day cab assembly for the vocational cab, added sheet metal and a radiator to the front and cut away the wheel arch.
Luckily, the day cab IS available in N scale:
https://www.showcaseminiatures.net/n_scale/n_scale_vehicles/148.htmlI will need to remove the nose, add sheet plastic and use the etched grill that came with the kit. I'll probably use etched metal marker/class lights as headlights.
Hank's Truck Pictures used to be invaluable in this type of research, but all that data is lost to time. That makes trying to find info on trucks like these especially difficult because they were made by White, GMC and Volvo at one point or another and Freightliner had a hand in them as well.