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The bottom shows four feet with rubber padding. The removable dust filter to the left sits under the PSU and can be pulled out to clean.
The H700i has shield plating (white ) that you use to hide the cables in the middle segment. Your PSU is separated in that lower left compartment. Air will be drawn in from the front based fan intakes. Graphics cards can be any size really. At the top two SSD trays are found as well as one in the front middle.
SSDs are easy to mount, just slide them in really. The chassis is very good with cable routing so you can easily hide away the majority of SATA and power connector cables.
At the inside top, you can see plenty of clearance/space for cooling, you can house a triple rad there for liquid cooling, you have roughly 55mm clearance for the rad and fans. Here you can mount 2x 140 or 3x 120mm