I was temped to give you a 2 here, but since the map works properly I feel I cannot do that. Still, how cheap can it get? All you did was swapping the textures in half a dozen places. About the biggest change you introduced was proudly listing yourself as "author" at the beginning of the script!
Who needs a new map that plays exactly like an existing one? If you look at the two "Winter" maps available here, one was meant to go with a tutorial, and the other one at least changed the gameplay of the map in question. Try to go for something a little more original next time.