External and internal modeling are first-rate, but the car is IMO virtually undriveable due to its hyper-sensitive turn-in which flings it sideways far too often. Haven't driven it enough to determine if this is due to a far too fast steering ratio or a suspension setup issue.
I made a mistake with the folder hierarchy, so you have to make a mazda_miata folder manually in AC cars folder and put the files into it. I will update the link with a help of an admin soon so you don't have to do this in the future.
You can find the proper link at AC forum until we can update the link here. Apologies for the mistake.