Well this was definitely a new one for me.  I came across an aluminum bodied double bass in a local craigslist ad: http://columbiamo.craigslist.org/msg/2589892484.html
 


 
 
I also found a video of one being played, although it's bit of a bad recording:

Cool, all you need now is the Tin Man from the 'Wizard Of Oz to play it !  LOL _____

upton bass had one of these in their shop a while back, although it was definitely different than the on you've found.
here's a link to what they found out about it:
http://www.uptonbass.com/catalog/product_info.php/cPath/21/products_id/390

Cool info , Thanks !

IMHO, the old growth aluminum is far superior to the aluminum of today.  It takes a while for the aluminum to forget that it was a bunch of Coke cans.
 
Bill, tgo

Hopefully the federal government won't raid the factory and confiscate pallets of aluminum.
 
(Message edited by Benson_Murrensun on September 14, 2011)

Nah, we're cool.  Judging by the 24 pack in my fridge it's not an endangered species.