The Great Book Of WWII Airplanes has an excellent Lanc section. Believe you'll enjoy Wantanabe's artwork on the gatefold pages.

Squadron Signal has a sale going on... Check out their N-SA6536 Avro Lancaster: A Compreshensive Guide for the Modeler It was 39.95 and now 29.96. Perhaps someone here owns this book and can shed some light on its contents. Sounds like it covers the subject well.