If sum1 can make me a lightsaber will you please PM me so i can email you the textures i have made for it. I have made the item aswell, I just dont know how to associate the item with the new texture. :(
Did you try the tutorials?
Give your textures a name (such as iw_lghtsbr_199) open up your lightsaber with KOTOR tool, and change the model variation to 199.