Thanks all for the input! Great site, the Ambassador project. Way more advanced than what I can do, but hey, itīs my first one!
Today I hooked up my converter and fishwired the 12 V cables from the back wall down to the 110V fusebox and connected everything. Then went around and checked the power and...surprise. All 12 V outlets have power! The aluminum interior wall seems to be ground (didnīt know aluminum was a good ground)! So I can go on now and order my batteries and get my 12V lights installed!
By the way, does anyone have a good source for built in halogen spotlights for under the cabinets? I am planning on installing 3 spot lights each side under the overhead cabinets. 12 V or course!
I will post some images once I have figured out how to do that!