MLA,
How would you address the inequity in power as distributed to the speakers so that you would have equal amplitude from all six speakers? Seems like the bow would play louder than the cockpit.
Close the windshield!
As noted, I feel this is a decent option with what there is to work with. I also do not feel that 3 identical speakers wired in this fashion will yield a noticeable difference. What are your thoughts?