darian ordo over at mando mercs uses a chainmail hood. we've roundtabled chainmail over there over and over. the general consensus was the time involved in making it vs the protective ability combined with the fact that really no known star wars characters use it, it should be used sparingly. we don;t like to tell our members they can't use something, although on some things we must, we would rather ask for heavy mods or limited use so as not to stifle creativity. based on known star wars canon and eu, it would seem that most of the protective undersuits worn by various troopers/warriors in the swu would offer similar protection as chainmail.
all that said, i think if you used it sparingly with your heavy concept or as a dressing, say a kama, it would look great. i use it sparingly on my ggloves and gauntlets.
great build btw, i've been watching it's progress. really dig the helmet although it has a heavy clone feel to me, probably bcause of the "mouth" area.
keep up the good work!