Warren, you find the best things.
If it were me, I would call the cops, and have them check me out and put me on a whitelist. However, the cops here are mellow and my dad knows some, so getting raided "just because" isn't an issue. In your case, you probably should just listen to your gut. Even if your gut wasn't mumbling at you, I'd still say that "just because I can doesn't mean you should" because clearly, the cops there are a very different and less understanding sort.
In your case....I would be inclined to invite the neighbors over for a cookout. Have a "lets get to know each other party." Play games where you talk, and share about yourselves. And when it's your turn, you show them your greenhouse. On the one hand, you can gripe about "I shouldn't have to do this omgomgomg nazi germany", or you could look at it as an opportunity to share the hobby and perhaps interest others. I love sharing and educating people every chance I get, and if I felt threatened, I certainly would, cause it's far easier than unknown and dread.
Blocking out your windows *now* would just be extra shady. But you could. You don't even need real shades, just get fabric at walmart and thumbtack it over. That's what I did as soon as I got my room. But that's because I'm nocturnal and the morning light shining in can give me migraines. It's only a coincidence I grow in my bedroom as well, so it's not an issue for me. I have an agenda against open/see through windows, so even when I have grow rooms, they'll be blocked out anyway