Note that if you do the 420/360 combination shown in the first image, the front 420 radiator needs to be a slim model. There is 423 mm between the rear PCIe slots and the front fan/radiator bracket, and only 40 mm space between the bottom bracket and the first rear slot, so only part of the radiator will fit under it.
With our Celsius S36 mounted in the bottom, which has a length of 403 mm, you would have a max front radiator thickness of 25 mm, and tubes mounted on the top side of the case.
If mounting a 420 mm radiator in the bottom, the max length is 461 mm, but might interfere with other components depending on thickness.