Hi, let me first say hello and that your project looks like to be a very interesting one.
Let me introduce myself, I'm developing software for MSFS since about 12 years now. My current major product is an AI traffic product, for which I have built around 150 different aircraft models with almost 5000 different paints. Before that I made mesh sceneries and covered the world with Landclass sceneries, the first Land Classes beyond the USGS data. A newer project in this context is the photorealistic coverage of Germany where I participated in the team that created the Germany VFR series, not only photo scenery with about 1 m resoultion, but also full autogen coverage of forests,, bushes and almost every hosue in Germany.
But my first project was the one that comes into mind when I see your project - I created a virtual model railway tool for FS95/FS98, and that might be an application that I see for your world, to allow users to build virtual railways in real size landscape.