RTF is a global modification that replaces all towns in the game.

...there's an issue with the meteorite crater. It's placed instead of a gem mine. And the problem is that you can walk across half of the crater (enter inside the model). I can't make it smaller because it needs to be a decent size, and if I try to make that part impassable, the building becomes uncapturable :( I could use some help with these problems.

Based on the screenshot of the tab:
blocked Tiles - impassable areas of the object
active Tiles - the contact cell of the object (there can be several; then, when capturing, the hero will go to the nearest cell to capture the mine, dwelling, etc.). It should not be blocked by blocked Tiles
hole Tiles - cells on which the texture of the ground surface is removed (used to create craters, etc.)
Each cell needs to be assigned X and Y positions relative to the center of the model (e.g., x=4, y=-3).