i just noticed this thread...
on the note of accuracy, it depends on if you are doing RotJ or ESB. as i understand it, the RotJ helmet had a smoked visor, while the ESB one had the green.
finding a green welding shield is easy, and if you are going ESB that's the way to go.
if you don't have a plastic supplier around, finding the smoked stuff can be tough, which is why the ebay guy is a good resource. there's no place convenient to me that i can pick up a small piece of smoke acrylic, so it's easier to just buy the lens already cut.
i had mine made to measure for the helmet, so it fit great
