I, personally, would opt for one open bay as you had mentioned. This would draw the eye of the observer to the right side of the machine and balance the national insignia on the left. On the other hand, you could fold the left wing and have the right one with gun bay opened..... regardless, this is a very nice thread to watch.
I'll also look into the gun bay color. If memory serves, earlier Hellcats had the yellow tinted primer and later production used green, but I'm not certain enough to say for sure.