Hmm... Mixed emotions about this.. I could look sweet in a "race car" type of look. But I cannot image the sound quality.
If you have the means why not? I have seen several metal enclosures that worked very well.
I think the more sensible option would be a wood box with aluminum on the outside but thats just me.
There have been various metals used many times over the years. One of the most notable would be Alma Gates.