The pond in question here is probably going to have an average pool size of 1.75-1.9 acres and 2.5 acres when completely full (really big shallow wetland area for a variety of reasons). I have placed in a lot of natural structure as well, so there's a good number of hiding spots for both fish.
I guess the part about the bluegills eating other crustaceans resonated with me because one of the things I did see out there was a giant water bug about the size of my thumbnail. This pond just started filling up 3 days ago, so not sure where this guy came from. I also remember seeing the water bugs (much smaller) when we were trying to pump water out while the pond was under construction as well. So with in a few weeks it sounds like we will have a lot of alternative food sources available for the bluegill to eat.