Sorry Walton, but even if you could receive the armor before Halloween you'd be hard pressed to assemble it to be ready for the 31st. Especially if it's your first build you really need to budget more time for the construction. I'd say a helmet could be done before Halloween, but not the whole suit.
You can also go to a hardware store and buy some screen-door screen. If they have scrap that's all you need. Otherwise a roll will outfit your whole garrison. I just got glued mine in place.