It's already looking better, thank you! Some more things, I hope you don't mind:
Could you rotate the whole thing by -90° so the default orientation is the same as that of wonders and other structures, and people face the entrance by default?
The capitals of the corner columns are still wrong. They're supposed to end in a point, like this:
It's important to get this right, also for other structures that (will) use the Ionic order.
Chariots tend to carry two people: the charioteer (driver) and the warrior (passenger). In this case, Mausolos and Artemisia; since M. was the more important person, A. would be the one holding the reigns.
Also remove that circle the chariot is standing on, if possible; it looks out of place.
As for the files, they shouldn't be Macedonian; if anything, Persian, but it's probably better to place the actor under `global/`, name the template simply `mausoleum.xml`, and leave the <civ> unspecified, so it defaults to gaia. Furthermore, the specific name ought to be simply “Mausōleion” (Μαυσωλεῖον); only in later times did the word gradually become generic; for the generic name, “Tomb of Mausolus” would be a bit more correct, though “Mausoleum at Halicarnassus” probably a bit more recognizable for a modern audience.
Maybe rename the Carthaginian structure to “tomb” or “cenotaph”?