it's difficult but plausible, the thing is there is not unhackable games and once a hack has been found for cs2d max, being closed-source won't do much good...
btw. it is not only a just a skin.
he also changed many parts of the source, added new gametypes, changed weapon slots and added new weapons with new physics like the rocket launcher.
well,as you wish...
we all want to try this new mod and you know it
I tried the last version of this mod that is listed in the forum of the official site of unreal tournament 2D
and i like it,but i believe that you guys can do still better