I am more interested in your simulation model than any of your graphical components. From what I have gathered through reading of your map generator posts you have modeled the creation based on other fields understanding, land mass location from tectonics, and weather patterns mapping to terrain features. Why reinvent the wheel, I would rather give credit and build faster to my dream game. For me each cell you create your data for would contain the “theme” data for that world cell/area.
I am not new to coding and game design/theory, but definitely new to unreal, it is unreal and very overwhelming. I am having troubles understanding the community on one regard, well several actually. Many have created either awesome projects or niche tools but they are wary of releasing because of support concerns, why not just release on an as-is/no-support basis and price accordingly? I have not reviewed the marketplace with any scrutiny as I feel I have to much to learn right now to be concerned with it, so this maybe a superfluous question.