In 1973 Model Railroader did a two issue feature on the K-27's. It had lots of drawings and showed the differenced between each of the 15 differen members of the class.
I was working a summer job in a civil engineering company and I got the photo guy to put all the plans onto a single piece of film so that blue prints could be easily made.
I've had some people frame the print and hang it on the wall even though I had intended it for building a model.
If you want a copy, I'll dig out the film and let you have a copy for my reproduction and shipping costs.
Doug.