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BTW, Marco - I've seen You're using Geiger on Stratosphera - could You give me a hint where You get it? Or is it made from scratch on Geiger tube?
I can do better Hevelius project is open so all documentation will be available - if You're interested. Now, I don't know how exactly Stratosphera was designed (I am curious though - would be nice if You could point me to that), but perhaps You could use something from our desing if it fits Your needs.