This is perfect! A list of manufacturers that sell enclosures! Most have boxes with battery covers!!

New Age Enclosures: http://www.newageenclosures.com/
PacTec: http://www.pactecenclosures.com/
Serpac: http://www.serpac.com/
PolyCase: http://www.polycase.com/
EAI : http://www.plasticelectronicenclosure.com/
Evatron: http://www.evatron.com/
Plastronic: http://www.pei2000.com/
OKW Enclosures: http://www.okwenclosures.com/

The VM series (probably VM-24) from PolyCase should suit my needs. Slim, low profile… perfect!