Well, I thought about enlarging the pond up close to the deck, but there is a safety factor to worry about, as there will not be any railings on the deck.
I figured the bog would look good next to the deck, with the plants growing up past the edge of the deck. I won't put anything super tall in it, or it would block the view of the pond.
I am widening the pond though. Instead of its current 6' wide, its going to be closer to 8' wide. So total gallonage is increasing accordingly. New projected size: 15'Lx8'Wx4'D = 3,590.65 gallons. I'm guessing that it will actually be between 3,000 and 3,300g, since the floor will slope, and the walls slope a little as well.
I'll post some more pics tonight when i get home. I've got the top half of the bog filter framed and setting where I think I want it, and I started digging the pond out wider Sunday. It sprinkled just enough yesterday to keep me from doing any more digging though. I might be able to get the digging done tonight, but its not really a rush since I don't have the liner for the pond yet.
Oh, and the INSIDE dimensions of the bog filter will be: 71"Lx36.25"Wx24"D, with the water level around 22", so the bog will hold (before adding gravel) approximately 245g of water. The gravel will displace a lot of that, but its still a nice size bog!!