I'd buy one. It's what I have been asking for since I bought an ARIA. ATX fits in current cubes – why not? Get creative, but keep it the same size.
Exactly! but little more modification have to be mad to accommodate ATX. Only one that takes ATX that I know of is Qpack that is modded to get I/O panel is facing left panel. If you want I/O panel to face back, you have to increase width which makes it bigger. But I would still buy that. Matter in fact, I would definitely buy that.
P.S. Looking at the picture, it's good that way to mount PSU is not only to face fan towards top but have option to face down.