If you have the means why not? I have seen several metal enclosures that worked very well.
5 % equipment
90 % install
I think the more sensible option would be a wood box with aluminum on the outside but thats just me.
2007 Black Diamond FJ Cruiser with Box built by Pro-Rabbit
H/U Kenwood DNX6960
Sub: 1-18" Zv3 with NS coils and cone Sub Amp: Mmats 2100.2
Front Stage: Hybrid Audio L6 mids, SEAS Neo Tweets, SAX 100.4, RF 3sixty.2
Bought From: Rio, davidtemple, Bassin Buick, Pro-Rabbit, Kangaroux, KyleBechtold Traded With: WhiteDragon551 Sold To: jdmeklove, Kpozr2, 97accordalpine