Hello Filippo,
You have been very persistent and patient, but I can not rush the US Federal Copyright Service to get things done faster... If you will send me an email "donprince5207@comcast.net" stating that you will not distribute the non-copyright version of Skizzenbuch, then I will send you a link to my dropbox website Skizzenbuch folder and you may download the "Skizzenbuch 11 x 17 - M + I.PDF" file and the accompanying "Wallet" folder containing nine (9) large drawings. Once the Copyright version is available, then you must delete the non-copyright version because I may still be making any needed corrections.
PS: Let me know what you think of our four (4) year collaborative Skizzenbuch: U-Boat Type VII C Project...
Regards,
Don_