New lighting ideas and I need feedback on a few?'s!

Okay, here's my latest idea. For the longest time I've been trying to make my 57 BelAir light up like an X-Mas tree. So, I came up with the idea to use bare metal foil and old lights out of McDonnalds toys to light my car. The plan was to use the foil as a self adhering wire and connect the foil to the inside of the body. The problem is that I want to put the batteries in the trunk and have to 1: figure out a switch of some sort, and 2: figure out a contact point of some sort between the body and the chasis. Problem is how to do this when it must be built before final assembly and then actually make contact when assembled!!!! So if any one has ideas, I would apreciate them alot!!!! Thanks