I am sorry to tell you that you need far more than "skins" and "sounds" to create a "Cs 2d Mode" (but then again , what do I know)
So why don't you tell us more ...
-How is this mode different from the other mods ?!?
-Is it a Single Player mode or pure Multi Player.
I can help you with you maps im a good map editor!
If you want i can creat any map you would like!
I always like to make the best map for all players of cs2d just tell me what kind of map you want and i will get to buisness!