Hi David, I think you are right on target
. There is an opening at the front of the turret which I put down to a possible ventilation duct but it does fit in with tray area. Russ Gregg also thought it was for casings too but I also said they were ejected from the inside. It make sense now!! I don't have any drawings or pictures or the inside of that area but with some earlier comments of a casing bag inside under the guns is probably wrong.. It must be a fool proof and complicated system to get them out as a blockage would be very hard to clear. I guess that is one part I won't be making but it is good to know what it's for
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Colin