We now have the correct size armored cable and fittings to install the wiring to the control jumper receptacles, so I spent a couple of hours fitting parts and cutting pieces to shape. It's not all done, but there's enough for me to take home and work on. And I did some more paint stripping, and helped Rod clean up the shop a little. Sorry, no pictures, but maybe tomorrow I'll have some of the new material assembled here at home.
Update: Here we have the first box attached to the armored cable, with the wires trimmed and connected to the toy connector box. All connector lugs are soldered, and all connections tested. It's ready to install.