Thanks for all the replies, I found the perfect space to fit it in against that wall. 200 gallons is going to take a long time to fill. The only thing I didn't do was put the polystyrene layer between the tank and the cabinet, so I will do that tonight. Then I can put the edging around that part to cover it all up.
Can't wait to get it running, and the aro and friends in!
Mike.