RTF is a global modification that replaces all towns in the game.

I don't understand, the polygons keep disappearing here and there. Is this because there are too many of them?

Added 2 minutes ago
Hey, I forgot to triangulate the mech – I just noticed.

Added 1 minute ago
Oh, and also, yes, the model isn't scaled at all – I have standard settings in Blender, and it's clearly not for Heroes 5.