I though of doing that with my 20G but I find divided tanks are a PITA to gravel siphon ( I have 2 10G's divided 3 ways).
Well I know some people cleverly put it in the middle and hide it with large plants. I think I'm going to try to put the heater in the middle and maybe use two filters, one in each corner. But first I'm going to put the heater in one corner and see how much of a difference I get in temperature on both ends of the tank. Alternatively, I have 4-6 small sponge filters I got cheap off ebay, so if I think the flow isn't very good then I'll just put one in each section and connect them all together.
I think if it were me, I would put 2 or 3 sponge filters in there, that way they all get good circulation. I know for my divided tanks, I have a HOB filter in the corner with the heater and the other compartments tend to not be as clean - especially the one on the other end.
SOme driftwood and Anubias would look lovely in there.