Flame Arrestor Battery Charging Station - Ammo Box

The goal was to create a portable charging station that could contain a lipo fire and also prevent the fire from spreading while minimizing pressure buildup. Let me know what you think, and any thoughts on improving the design.

Materials:
$20 Used 50 Cal Ammo Can - http://www.amazon.com/gp/offer-listing/B00NJ3JTCU 
$7.49 3M 499 Fiberglass Cloth - https://www.amazon.com/gp/product/B000BQSKQY
$5.47 Bronze Fine Wool Pad - http://www.amazon.com/HOMAX-PRODUCTS.../dp/B0000AXS0Q
$2.08 Gampak Connector - http://www.lowes.com/pd/Gampak-3-4-i...nector/3389324
Hood range filter (the filters that go over your stove)
$6 Lipo safety bag - http://www.banggood.com/RC-lipo-Saft...-p-938751.html
Double stick tape

Optional:
$4.99 Bcase Cable organizer - http://www.banggood.com/Bcase-TUP-Ma...p-1023797.html
$5 2S, 3S, 4S, 6S extension cables - http://www.banggood.com/Lipo-Battery...-p-951866.html

Tools:
Drill
Hole step drill bit
Rivet gun and rivets
1 3/8" Hole saw

The layering of the flame arrester from top down:
Hood range filter screen mesh
Fiber glass
Bronze wool pad
Hood range filter screen mesh
Stainless grating from hood range filter - this piece is riveted to the ammo can compressing the layers