Hi, if you are interested in Italian aircraft, I like to inform that on e-bay are available e-books containing the copies of component catalogue of two important medium bombers: the SIAI SM 79 and CRDA Cant Z 1007 bis
Those catalogues were issued to explain how each part of the aircraft was built and went together in assemblies like wings etc.
As en example I enclose two pages taken from the book of Macchi C 200


Of course text is in Italian ...
If you are at all interested, the link is the following:
Venditore eBay: tilgeman: Libri e Riviste su eBay Italia
Cheers
Alberto