You are right. I didn't mean that to change the proportion of the case. They should absolutely keep the beautiful design "golden ratio"So... Micro ATX?
I personally think that it if possible shouldn't be bigger. While I totally agree that it would be awesome to have both fans, I would rather see a solution where the motherboard is for example moved a bit up, and the 240mm rad supports two slim fans instead of having the case be taller.
To not screw up the beautiful ratio between height and width, you'd also have to make the case wider if the 240mm rad was to support a second fan, further contributing to the size increase. Small dimension increases make a larger volume difference that you'd think.
Also, having a 240mm rad isn't the only option. Right now, the back most fan slot (in your scenario probably covered up by the second half of the 240mm rad) could be used for a beefy 120mm fan, while only having a 120mm rad up front, maybe even making a bigger difference temp wise (if not to the CPU, probably to the GPU with the added airflow from the bottom).
It seems like their design is slightly bigger than Dan S4-SFX but again, seems like hitting the same thermal issues?!
Then with this price,.... I've been seen people disagree with the price range so was too worried......
But making it bigger wouldn't be a solution. But like you said, move MOBO bit upwards and make space for another fan with rad would be great I think.