Yes the Kraken X61/ Kraken X62 / Kraken X41 / Kraken X42 can be mounted only in the front without removing the cable management bar, and the Kraken X31 can be mounted only in the rear.
You connect the VR via HDMI on the front of the case which links it to an HDMI cable that goes to the back of that case which connects to the GPU.
The S340 Elite has 4 SSD slots included.
Yes, it will but it would require modding which can lead to void the warranty of your case.
The Puck is available for purchase! You can purchase it here: https://www.nzxt.com/products/puck-black
Tech Specs of the S340 Elite
|Dimensions||W: 203mm H: 474mm D: 432mm|
|Material(s)||Tempered glass side panel, Steel, ABS plastic|
|Motherboard Support||mini-ITX, MicroATX, ATX|
|I/O Ports||1x Audio/Mic
2x USB 3.0
2x USB 2.0
HDMI with VR Support
|Drive Bays||Internal 3.5": 2+1
Internal 2.5": 3+1
|Radiator Support||Front 2 x 140 or 2 x 120mm
Rear 1 x 120mm
|Fan Support||Front: 2x 140/2x120mm
Top: 1x 140/120mm (1 x 120mm FN V2 Fans Included)
Rear: 1x 120mm (1 x 120mm FN V2 Fan Included)
|Clearance||GPU Clearance With Radiator: 334mm
GPU Clearance Without Radiator: 364mm
CPU Cooler: 161mm
Cable Management: Lowest Point - 17mm; Highest Point 168mm