very nice. i have a question about casting it though, and can't seem to find any real answers due to my noobish abilities.
for the molding and casting, is the silicone one whole part like Adam's video of the (I think) ODST helmet?
and if so, when you cast it, did you just slush around some liquid plastic, like centrifugal casting or something?
because if that was the case, then with the master chief helmet, wouldn't most of the liquid plastic just get caught around the visor, since it isn't really too much of a bucket? i want to try to mold a pep MC helmet, but i'm just unsure of the way to go about it =\
but yes, your work is very nice