I think waiting for the Cosmos 2 is your best bet. It's got support for a 360mm (60mm thick) rad in the roof and a 240 rad in the bottom drive cages (also 60mm thick). And it's HUGE. I've read 20% larger internally that the original.
Cosmos S dimensions for reference = [font=Tahoma, Verdana, Geneva, Arial, Helvetica, sans-serif](W) 266 x (H) 598 x (D) 628mm[/font]
I hope CM releases a windowed side panel. No word on that yet.