Well a long time since I updated this! Basically next up is the lights project. To facilitate this I put a long length of bare copper single core cable under the gradient,

Then I wound 25 lengths of insulated 0.6 wire around it ,soldered them on and dropped them below the baseboard via drilled holes. Another length of wire is connected to a 12v supply + via dimmer switch. The common return is via the track. Team leader Clive will install lights in the buldings and drop wires down to connect up.
To conceal the wire I built a wall just shy of 9 feet long.

It's not finished yet but this is it so far.