I think this was really interesting. I'm not sure if I really "get it", especially the stuff about intertextuality and the ability to skip the flashback scenes, but I still have some stuff to say.
First, I like the idea of a place that you love. I've never felt that a place was special to me, and I find Erica's attachment to Fort Colwyn to be fascinating.
I don't know how to say this, but it feels... dry? In a good way, like something that would be on your high school's Summer Reading List. Maybe it's just because it takes place in the mid-1900's? Either way, by dry I don't mean boring, but more, comfortable? A lot of fiction I read is very, high energy, I guess. It's interesting to have something that returns me to my roots I guess, but still has interesting stuff about nations and lesbians and age gap relationships.
I just want to say that this is one of the few VNs where I "felt" the sex scene with Erica and Nicole. Nicole is obviously my favorite because she's such a goober (she has the Ocean Limited!), but her desire for Erica is communicated in such a way that actually got to me, which is incredibly rare for a sex scene.
All in all, this is amazing. The effort and skill in this work is plain to see, and you should feel proud of this, I think.