Thanks for all the responses guys! It sounds like it maaaaybe might work, but everything would be pretty damn close. If I had more money, I'd just buy the case and the parts and see what happened buuuut....
I
think it could be done with a 120mm rad for the gpu, and a gpu loop with a combined pump/block, like the
alphacool Eiswolf Pro. But at that point that's not really much of an upgrade over a good air cooler on the gpu anyway. I really can't see how a 240mm rad could fit anywhere. Possiblely an extra slim one (I think there's some ~25mm thick rads) with fans mounted externally?
Still, if someone else comes across this thread and wants to do it for style points, I
think this is how it could be done:
120mm version of the Eiswolf could be mounted to the top XL-vent.
92mm AIOs do exist for cpu. So possibly you can mount that to the rear fan opening. Might fit, might have to be pushed down a little. Hard to say.
Alternatively, use something like the Noctua NH-L12S with the fan mounted underneath and pointing up. Then you're blowing hot air from the cpu directly into the radiator which can't be good, but it's doable...
Anyway, thanks all for engaging with that thought experiment and helping me out
Still love the case, might buy one for a media pc in the future. For now, I got an Xtia XProto and am going to slap a 280mm rad on it, and finally have a Vega64 that isn't roasting