Model railroader cyclopedia volII is all diesel plans. Plans are occasionally published in Model Railroader magazine (and probably other train magazines). You can search for plans on the model railroader website, and then finde the back issue on ebay or at a train show.
Yeah, good book recommendation!!! I just went to the library to sign out it, I also signed out the Vol.1 while I was there too. Great books, exactly what I need. Thank you.