This is probably something that needs to be taken up with the original designer of the map. The FR Atlas map is just a faithful reproduction of an actual product map

The scale are from the original Myth Drannor maps from TSR.

The original Ruins of Myth Drannor Map specified 1 inch = 100 '. The non-ruin map that the one you posted is based on doesn't specify a scale as far as I can see, but it makes sense it is in the same scale as the ruins map, since it is the same place.

I looked at the original maps, and made some clips from the area around the building in the bottom left of your clip. Based on how the artist drew them, it certainly seems looks like they were drawing them like individual, to-scale buildings. But I do agree with you, the sizes is a bit large. So I'll probably chalk this down to a bit of a poor quality control with the original design. Lots of maps from those days played a bit loose with scale.

Not sure why it happens, seems like it happens when the X-dimension gets too large. Since it preserves the aspect ratio of the image, try inserting it using 0,0 for the first corner and 10,10000 for the second corner. The 10 in the second coordinate is basically ignored because aspect ratio is kept. (But you need to use a number larger than 0, so 0,10000 doesn't work)

Keep in mind when you export these that you let the symbols in the back rising above the map border be part of the export, that helps put emphasis on the 3-dimensionality of the map..... (Just fix the screen if it gets in the way....)

Anything is possible from a drawing perspective, but there are several of CC3+'s tools that don't work correclty

• Measurements, including distances and angles assumes a a flat map. These can't be used to get accurate data on a curve
• Drawing tools that stop at the map border only work with straight orthogonal lines. This feature doesn't work along a circle or angled line
• Images are rectangular, anything not-rectangular will add empty areas on exports.
• The coordinate system assumes a flat surface, coordinates won't be correct for a curved world.
• Effects also assume a flat surface. This is why many effects cannot be used properly in an isometric map. Not quite as big a problem on a curved map, most things will probably still look fine.

But that said, there are already styles for a curved approach, like the Mercator style from the very first annual (later updated in a newer annual).

Generally, for a whole-world map, Equirectangular works fine. But it distorts shape and area as you get closer to the poles, so it isn't as good a projection for areas far to the north or south. Here something more true to shape may be desired, like the Equal earth projection. For the polar regions themselves, something like the Lambert Azimuthal Equal-Area may be a good idea.

Basically, each projection in FT3+ comes with a descriptive text, I advice you to read it.