I'd prefer the b-uhr style engraving to be on the inside of the caseback and whatever we choose (in German, as is appropriate) to be on the outside - No/50, Messbattery, WUS-SE, etc. I think any reference to a school or missile or research or SS location is not a good idea. Matte finish, solid caseback is the obvious choice. I'd like to see the FL text on the side of the watch, but will live with voting results.
In a separate but related issue, where are all the folks who were so enthusiastic about this project? I see 5 or 6 folks contributing ideas, but no others participating in the discussion.