Connected some harnesses, checked for longest component/harness/connector items, compared to other components. Decided to open several pass-thru points in subpanel to accomodate harness routing. Although SV-10" panel is not here, the drawings indicated the connectors and dimensions and it's shorter, making the intercom and D25 connector the critical distance.
Opened a rectangular slot in subpanel directly behind intercom to pass-thru the D25 connector. This puts the comm harness forward of the subpanel for routing.
Alternative would be to order a 90 deg angle D25 adapter to allow easy connection on the aft side of subpanel.