The ME and the ME II are different in this regard. The ME has the same small amount of space for through the mount wiring in either configuration. If I'm following you correctly, in one configuration with the ME II you get a huge amount of space for through the mount wiring, but in the alternate configuration you're reduced to the same amount of space we get with the ME in either configuration.
https://www.youtube.com/watch?v=rKwwcCpa2Ag
