A quick photo of the underside of the middle board, showing the DCC 'bus' wiring, basically a negative and positive wire running constantly around the board with smaller feeder wires which connect to the track:

 The feeder wires are made by Peco and have rail joiners fitted to the end of them, so you slot standard track pieces into them from either side and there you go, instant easy and almost completely hidden power feeds. The red plastic connectors are 'piggyback' style clips, which simply click into position over the bus wire, then you poke the feeder wire into the other part of the clip and clamp it down with large grips or pliers and it makes the connection for you AND retains the continuity of the bus wires. Excellent little things.

I bought a second power connector for the NCE Powercab control system, so I can simply unplug the mains adapter and the controller(s) from the garage layout and plug into this one.

Wires to operate the points have yet to be fitted in the above photo, nor the connections to the left and right boards, so I'll take a photo of that soon and explain the construction - its all pretty simple.