@xanax The decimate modifier works fairly well, but the main concern would be compatibility with old textures (Unless someone updates them all at once, but that is not likely to happen)
The thing is while you don't when making your mod, when putting textures under CC-BY-SA you allow people to create derivative texture packs from your textures hereby breaking the rules.
@xanax Since we would probably use them as textures or part of textures and since our license allow these textures to be resold you can't use them to do anything. 0ad had a special derogation back in the days when it became open source but that's it.
@Alexandermb Yeah that's the issue for mount and bailey that's why I made the little fort.
Once thing you could do is siege engines ? Like a ram for the Norse ?