We just did this w/ our ds last Thursday. He LOVED it. FYI - you can make a dual sided light saber for the same price as a one sided one. (But only one side of the saber lights up.) And they get to pick one of two trading pins to go with it. A great deal for only $20!
We are going to be at WDW at the end of May. When we visit DTD and have our boys make their light sabers I will be sure to get more pictures to post here.