Lynn,
You're not as new as this as I am! (You have a Newell!).
Great source for the DI set up. Steve's doesn't take up much room at all. I'm going back there tomorrow to take another look at #1274, and I'm sure he'll let me take a couple of pictures. While it is mounted in a bay, I don't remember it taking up all that much room.
Silly question, but the web site doesn't address it either...I wonder when you know you need to replace the resin canisters?