I had presumed that the six panels described in the first post were identical. That is, you did not have one that was 6 inches deep located right beside one that was 9 inches deep.
The basic requirement involves an imaginary box in front of each panel. The box is 30 inches wide, is 78 inches high, and is either 36, 42, or 48 inches deep (depending on the voltage level). The 30 inch dimension has to cover the entire front of the panel, but it need not include any space to the left, nor does it have to include any space to the right. It could start at the left edge of the panel, and extend somewhat beyond the right edge. It could start at the right edge of the panel, and extend somewhat beyond the left edge. It could be centered with the panel, so that the distance it extends beyond the left edge is the same as the distance it extends beyond the right edge.
Two identical panels can have their working space ?boxes? overlap. However, if one panel is 6 inches deep, and if the next panel to the right is 9 inches deep, then the working clearance ?box? for the left-hand panel cannot extend further right then the left edge of the right-hand panel. Put it this way: Imagine a panel that is 24 inches wide and 6 inches deep. It is located between two panels, each of which is 24 inches wide and 9 inches deep. If the panels have only 2 inches between them, then the total working space for the center panel is only 28 inches (i.e., its own 24 inches plus 2 inches on each side). That is a violation. Suppose instead that the panels have 3 inches of space between them. That gives the center panel a total of 30 inches (i.e., its own 24 inches plus 3 inches on each side). That is acceptable.
I am not skilled in creating and posting drawings. So I hope this description answers the question.
