There is a minor error in the 1973 MR plans for the K27. The front cab doors are a rectangle and not 5 sided as shown on the drawing. The drawing must have been based on 463 as it is now and its front cab doors were changed from how the engine was in the 30"s. If you look closely at all the photos in the K27 book you will see that the front cab doors are 4 sided not 5.