After tackling the hood, I returned to thickening and revising the insulator and radiator based on the photos. The text on the radiator was bigger than I thought based on the David Smith drawings, and I chose to exaggerate it a bit more, hoping to make it legible in 7mm scale (1:43.5). I also removed the "rails", figuring those could be added later with brass if I chose to do so. I imagine a lot of these items (radiator cover, details) were removed by soldiers. While it's possible that these parts were not removed until the units were resold as surplus after the war, soldiers are notoriously practical, and hate to waste time.
Here's the revised hood and radiator assembly. It's off to the printer now. I am looking forward to spending time on the cab tonight, after some time away from the computer. Getting exciting--I'm hearing the engine in my imagination. . . . .