To answer lloyd, very durable. A lot of people on here prefer it over fiberglass because it won't chip or crack as easily because it has some give upon impact.
Now on to mandolore's comment. I think he will be ablet pull these on a single sheet as long as he has nothing else on the forming table. I know stormtrooper ab plates, back plates, and boba fett backplates are done in single pulls. This is a lot smaller in terms of space on the forming table, it's just more vertical. I think if he heats the plastic well enough it should be fine.
-=QuinN!