This looks good--

http://hackaday.com/2012/08/13/convert-a-speaker-to-a-battery-powered-amplifying-party-box/

The article at Hack A Day links to www.instructables.com/id/Portable-Retro-Hi-Fi-Speaker/

Pertinent details: this speaker encloses a 12v 1.2 mAh sealed lead-acid battery.  Also on the…

My second CBG was given to a child and I wasn't too worried about it being "politically incorrect" on account of the smoking connection because his parents are smokers.  But, I probably won't do it again.  Instead, I'll use a school box like this from Amazon-- This box is manufactured by General Box Company, Waycross, Georgia, USA, and they sell this and some other school…

Cardboard box with very light reinforcing.  The neck is birch veneer and the box reinforcing is really light pine or something like that--all the wood came from a pallet made in Europe.  The lid is held on with four tiny screws.

18.75 inch scale length,…

My first CBG.  I didn't have a box handy so I built one about 8 1/2 x 11 x 1 1/2 inches.  The top, bottom, and fret board are a little thicker and stiffer than door skin plywood; the neck is scrounged (free) birch veneer plywood (12 plies). …