"Another though is to router or chisel a channel on the bottom for the power feed."
Carl, you can see in the pic there is such a channel provided on the underside of Fastrack pieces. It looks suitable for #18 wires but would be really difficult to use because the wires wouldn't stay in place while laying the track. With a layout this small if I wanted feed wires I'd probably drill holes through the ends and cross-braces and feed wires through the holes before flipping the whole assembled thing over onto the plywood base.
