Clearance
Maybe it is just the picture, but I would check there is large gaps from the bus bars to the panel. Since the panel is probably grounded to structure, I would think there should be enough of a gap so that a loose washer or screw would not get caught between the bus bars and the panel. With a little vibration thrown in, this could be a bad day. In my case, I added insulating Kapton tape on the metal near the bus bars, besides relying on the paint, just for that extra bit of margin. JMHO. YMMV