I tried to run some additional wiring through the interior but there is no great path in an ERA that enables the wires to be run invisibly. So I've decided to run a conduit under the from the front side (near the footbox) to the trunk. It will probably be 8' x 3/4" ID, and I don't expect it to be exposed to very high heat. The purposes are: (1) aesthetics, and (2) some extra protection for the wires. I found this on McMaster-Carr's website:
McMaster-Carr. Does anyone else have recommendations for conduit/sleeving?