HELP PLEASe

hey guys i need help modding :S. idk if this is possiable or not but just wondering.

i want to know how to make a crosshair mod. or if there is a tut on how to make please tell me. like or if u dont wana tell me can u make me one? its mod. so i want to exchange the old cross hair with the big circle one. its idea. dno if its possiable. i think its the same as crossmod idk :S. so please help me out

please reply quick lol

Impossible and illegal, I don't wanna get in more trouble, REZ editting already it self illegal, modding NX would be double the illegal.