There will be 4 control panels. I have built 3 so far. 2 on the left side and 1 on the right
This is the Left hand side "Signal box diagram"
Over on the Left Hand Side are Control panel 1 and 2. 1 switches the points via stud contact and isolates roads 1-7.
2 switches between DCC and DC. the colours on the diagram relate to switched sections. For DC control is hand held Modelex controllers. For DCC Z21