I noticed on one of the idea lists, it stated "less hills". If I'm not mistaken, weren't hills and mountainous regions a notable feature of Mongolia? I guess what I'm trying to say is, when I think of Mongolia, I think steppes, rather than all flatland.
Also, on another note. I don't know if it's at all possible to put into combat situations, but maybe have it as a 'static' creature of sorts, but I know that the Mongols were and still are fond of falconry. They hold a certain reverence for the eagles they hunt with.
Maybe you could fashion an eagle to perch on top of your banner during combat, and have a few in a town here and there. I'm not sure how you could, or if it's possible to implement them, in actual combat, and I doubt it would really make sense to have them fighting. But since they're such large part of Mongol culture, it would seem kind of wrong to leave them out completely, wouldn't it?