I just finished customizing a 12" Hasbro Stormtrooper. I used the following guys website with a photo tutorial on how to go about this:
Oh, you do have to go about 3/4 the way down the page to find the 12" Sandtrooper look-alike. There you will click on the little boxes to get hints on converting your own 12" figure!
I started by buying a "Dragon Nude" figure on eBay. I tried to find one that looked as close to me as possible. The following link will take you to the pictures of my personal 12" Stormtrooper figure! I love it, as you will see, it is a lot more articulated than the Hasbro version. I never thought I'd find myself doing this to one of my 12inch figures, but it was a lot of fun!
What do you think?