That looks like a great idea for the tank setup. I would setup some boxes or obstructions for a few days where you want it to go and just see if it works for the flow of the house. I saw a couple new houses I was looking at that had a similar spot I was thinking for a tank, between the living and dinning area. Can't wait to see how yours comes out.
Also, that tank is almost as big as the car. Wow.