At the End of the last year, I got my hands on a KASLO Shops Distributing model of the C40-8M. While preparing the model for the build, I am also taking measures, comparing them toba drawing in the Model Railroader Magazine (from back when) and blocking out a 3D printable model of it.
And for comparison some Photos
Here is a reference Model on TinkerCAD: https://www.tinkercad.com/things/iBp3PxTBH1l
And my remix (just to save the file): https://www.tinkercad.com/things/iIPKxLsrL6i