Hello, everybody!
Thanks for the feedback. The history of the AGS is indeed most interesting and Hans Landsdorf is one of the few German war heros pretty much untained by the Nazis.
The portholes were filled with dark wash. That's all.
That next video is in the making: Lot's of drying times now, so the progress is slow. the nextinstallation should be online on Sunday, I guess. Thanks for your patience!
Cheers,
Guido