The book I was referring to is the "Illustrated Treasury of Budd Railway Passenger Cars: 1931-1981".
Not as many diagrams on the Metroliners, but a wealth of photos of all things Budd and lots of great builder's photos of a majority of the Budd products. A must have for any fan of passenger cars.
I need to dig out Joe Acri's contact. He did research for me on the GG1 project and is thoroughly fluent in finding information in both the state archives of PA as well as some good connections to the PRRT&HS society.
His fees are not cheap, but certainly reasonably for the quality of product. Again, I'll need to do a little digging on contact info. It's been nearly two years.