Okay look, I really don't mean to be a tool but I have to ask: what safety standard are you guys using for this event? What constitutes "super hard plastic"?
The standard here is the
ANSI Z87.1-2003 standard, which is more then enough protection from even super hot AEGs fired from point blank. If this is your standard as well, you might want to consider revising your rules in the first post here to make that more obvious maybe have it say, "wrap around, full-seal goggles required that meet ANSI Z87.1 standards, wire mesh is not allowed". That would clear up everything that has been said here.