Hello there!
I'm trying to understand the idea you're presenting. You mentioned that a grid for the map would be nice, but I can't seem to find a practical use for it. I mean, could you try to explain in more detail what it would be used for and how it should function? I'm having trouble finding a useful and direct example. I'm sure your idea makes sense, but I'm not quite grasping it.
Also, keep in mind that the idea behind plugins is to add mechanics or features to the game in general. And if, as you mentioned, you'd like it to work with a building system, it might be complicated to implement due to compatibility issues (Personally, I've never really understood how those furniture plugins work, haha).
But back to the topic: If you could elaborate more on your idea, and if you'd like to attach a picture or sketch of how it should look and what elements it should include, that would also be helpful.
Best regards!