Hi junelac :)

Yes, you can sculpt more or less land into an existing FT3 world. I recommend opening the World Settings dialog, going to the Editing tab and checking the custom resolution box to set it up a bit like this. Any value you prefer in the box, though bear in mind that lower values will make editing clunky, while higher values will make the file rather big. Anything between about 4000 and the maximum, which is 8190, is better than the default.

Then make sure you have checked the Allow Prescale Offset Editing box at the bottom there, and click Apply before you shut the dialog.

After that, use the green prescale offset brushes, and make them plenty large with an extremely low power in the tool settings. By low I mean in the range of about 0.005 to 0.01. Then dab the area you want to raise or lower until you get it right.

Editing an FT3 world is easier if you don't have the Continental Shelves checked on the Secondary tab.

Whenever you change anything in this dialog remember to click Apply immediately afterwards, or your changes will not be applied.

Not sure about the sastrugi, but I think the fissures are all done now.

Well, the vote has changed in balance over the last few hours, and I'm also having issues with doing transparent tops for the more curvatious version on the right because the moment you take the top off you lose the shading and they just look totally weird. So what I propose is this:

I do 5 mesas like the one on the left with transparent tops, and 5 like the one on the right with solid tops - just as they already are, in fact.

That way, you can have the curvatious ones with the natural top for general use, and there will also be 5 slightly more practical ones you can stick a city symbol on top of and have whatever texture you like underneath it showing through. So you could use them to represent tepui and have a rich grass texture and add one of the waterfalls I will make to go with the cliffs generally.

How does that sound?

Thank you! :)

I've just done an open-topped variation of the flat one so people can have whatever they want on top, or just let the background show through.

5 of each?

I'm going to try and make them open at the top so they will have whatever fill you put them on.