Look forward to seeing those pics very much! Especially any showing mini a drive-in. That would actually be fairly easy to do, generally, with plants only around the edges. I can kind of picture it in my mind. Even though they don't have them anymore, I would put the speaker poles in rows. Matchbox cars, a printed photograph for the screen (preferably of that dancing hot dog, jumping into the bun.) Yeah!!
OK, be honest, back in the day, who has hit one of those poles with their car? Or started to drive away with the speaker still in the car?
I'm so glad there's still a drive-in theater around this area, though it's about an hour away. We go a few times per year.