I've begun doing some major rework on the subpanel / main controller case. I am adding a few safety features and also making room for two additional controllers. This picture shows the rear of the case. The gray rectangular box to the left is where the main power connects (the green, white, red and black connectors) and the black circular connectors towards the top are where the cord bundles attach using multi pin connectors. The circuit boards are the light controllers and to the front of the box (not visible) is a 100A Square D circuit breaker panel.