Couldn't you fit a 360 in the front as well as what you chose in the roof?
No.
At least not unless it was super-thin... I don't know if they even make a rad thin enough for that.
You can position the mount at the top of the case or the bottom.
At the top, it would interfere with a 480mm rad... at the bottom it would interfere with a 560mm rad.
With a 360mm rad at the top... yes, you could fit a 360 or a 420 at the front... or with a 420 at the bottom, you could fit a 420/360 in the front.
But I thought the 480/560/280 combo would be better over 360/560/420 or 480/420/420 combo.
This choice wasn't on full-out cooling ability as the 560/420/360 combo would probably just edge it out... but more for aethetics as it was more important to me to fill the top and bottom with rads - where the front practically looks the same if you have 3 fans... whatever rad you have behind them.
Maybe *maybe* a 360/420 rad could fit in the front if it was 30mm thickness absolute maximum.