@The Locksmith:
Well thank you very much, its really an honor for me to receive such nice words from all of you

And I am really happy that you like this project so much!
In a couple of weeks I will continue this work and if you like, I would give you some status updates (Photos, videos on youtube, etc.). I will first continue on building the remote combination viewer. I gathered all the missing parts together now (gears, bearings, housings) and so I am looking forward to finish this big part of the door. The used locks for the door are two Kromer high security 3-wheel combination locks.
Guys, thanks again for the kind words, you are motivating me to actually do some videos about the construction and operation of the door

My speeches in the coming videos will be in English of course!
Best regards from Germany
Maik