Another awesome update, Bob! :thumbs: You're the man!
Going back to the HE discussion for a minute... Maybe I'm not getting it, or overthinking what HTF said. I thought he meant that you won't see the HE in the London side, that it'd only be visible from Hogsmeade. Anyhow, this was my thought:
I don't think you'll see the train's engine when you are at the stations. Trains are long, so it would be believable that you're boarding or getting off the train's wagons at the station's boarding platform, while the engine is a bit further away. And if they have a wall all along the left side of the path from the Hogsmeade archway to the station, it wouldn't break the illusion.
Also, it doesn't look like there will be space any space for a photo op at/by the station. There's no space by Sinbad, so it'd have to be under Dragons, and I don't think they'll go for that.