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

Well, um... ahem... how to put it...
Here's the thing...
Maybe you just haven't finished working on it yet, or maybe I messed something up, but in general...
The units haven't been changed at all...
Instead of Mountain Orcs, there are just regular Gnomes...
And Sanctuary and Lizardmen have the same castle, which doesn't have a building animation...
Something went wrong with the heroes; the Dark Gnomes have a hero from the Mages, and the Elementalists have a hero from the Demons, and it even has the Demons' passive ability, which means it won't affect the gameplay in any way...
And as for the Chimera Mages, well, this is just my personal opinion, but the castle... okay, even if you leave the texture as it is and put up with it, at least change the background in build mode, because it looks like a "diamond or crystal" castle, but the background is a cave...