The interlibrary loan request yielded only the English version. The author (Andreas Zapf) had previously published another book - Mosquitos über Berlin: Nachtjagd mit Messerschmitt Bf 109 und Me 262 - which is much more detailed (~600 pages).
A lucky find at our local Lifeline charity bookstore, as new, just AUD$6.00! Next to read after I finish reading Solomons Airwar Vol 5, down to the last couple of chapters.