Hey mate.
Good job so far. Such a big case and every rad is external? Thats all good
If you're going that route then maybe the following idea may work for you...
If you're looking to mount a second 560 then why not mount them side by side at the front of the case in a sideways position. So if you're looking at the case from the side, you'd be looking at the front of the rad with the other directly behind it. Make sense..? Could look pretty cool but will require some custom rad mounts to be made. I considered this myself at one time but didn't want to lose Lian Li's nice front cover. You've got a lot of rads bolted to that thing, is it really necessary? Otherwise, keep up the good work, mate. Sorry to plant such a crazy idea in your head.