I took the pcpp part list from your video description and refined it a bit.
PCPartPicker part list /
Price breakdown by merchant
CPU: Intel Core i7-7700K 4.2GHz Quad-Core Processor ($343.22 @ OutletPC)
CPU Cooler: be quiet! Dark Rock Pro 3 67.8 CFM Fluid Dynamic Bearing CPU Cooler ($82.39 @ OutletPC)
Motherboard: MSI Z270 GAMING M7 ATX LGA1151 Motherboard ($239.88 @ OutletPC)
Memory: Corsair Vengeance LPX 32GB (2 x 16GB) DDR4-3000 Memory ($259.99 @ Amazon)
Storage: Samsung 960 Evo 500GB M.2-2280 Solid State Drive ($249.98 @ NCIX US)
Storage: Samsung 960 Pro 1.0TB M.2-2280 Solid State Drive ($629.95 @ B&H)
Video Card: EVGA GeForce GTX 1080 8GB Superclocked Gaming ACX 3.0 Video Card ($529.99 @ B&H)
Case: Fractal Design Define R5 Blackout Edition w/ Window ATX Mid Tower Case ($119.99 @ Amazon)
Power Supply: SeaSonic PRIME 650W 80+ Titanium Certified Fully-Modular ATX Power Supply ($139.99 @ SuperBiiz)
Optical Drive: LG WH14NS40 Blu-Ray/DVD/CD Writer ($46.88 @ OutletPC)
Operating System: Microsoft Windows 10 Pro OEM 64-bit ($138.88 @ OutletPC)
Monitor: LG 27UD58-B 27.0" 3840x2160 60Hz Monitor ($395.42 @ Amazon)
Total: $3176.56
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-04-02 09:04 EDT-0400
Changes made
RAM: G.Skill 2x 16GB 3200 Mhz -> Corsair 2x 16GB 3000 Mhz
PSU: EVGA SuperNOVA 650P2 (650W, 80+ Platinum) -> Seasonic PRIME 650 (650W, 80+ Titanium)
Reasons why
RAM: Since you went with Be Quiet! Dark Rock Pro 3 CPU cooler (which is one of the best big air coolers and i personally like it too), you have RAM clearance of 40mm. That means you can't use high-profile RAM. Corsair Vengeance LPX RAM is 31mm tall and it's normal profile RAM. With Corsair RAM, you can install CPU cooler over the RAM slots just fine, where the CPU cooler's front fan is facing the ODD/HDD bay.
With Corsair RAM, it's wise to install RAM before installing the CPU cooler. It's easier this way.
Note: There is also 3200 Mhz Corsair RAM available but that costs $70 more than the 3000 Mhz one.
Since you have G.Skill RAM in there, which is high-profile RAM (42mm), you had to turn your CPU cooler 90 degrees. That in turn caused you to remove the front fan, to house your GPU, thus reducing the CPU cooler's cooling performance considerably. Even though your idle temps are 26 degrees Celsius, the drawback appears once the CPU is under heavy load and CPU cooler may struggle to cool the CPU since it only has 1 fan installed.
PSU: EVGA SuperNOVA P2 series PSU is of great quality PSU and it will do just fine. But when you have the money, why not go with the best 650W PSU money can buy at current date? Introducing the flagship of Seasonic PSUs: a Seasonic PRIME 650.
Seasonic PRIME 650 has the best efficiency there is (80+ Titanium), while being dead silent, even under the worst conditions. PSU also has hybrid fan control that you can toggle off from the button on the PSU and PSU comes with hefty 10 years of warranty.
review:
http://www.tomshardware.com/reviews/seasonic-prime-titanium-650w-psu,4690.html
specs: https://seasonic.com/product/prime-650-w-titanium/
(My Skylake build is also powered by Seasonic PRIME 650, full specs in my sig.)
About your case.
Since you don't use any 2.5" or 3.5" storage devices, i'd remove both HDD cages for better airflow from the front intake fans.
As far as the video itself goes, it would've been nice to see the entire process on how the entire build was put together. Something like this, where others can learn from the mistakes made by builders and also to get heads up regarding specific hardware in a specific case,
youtube:
https://www.youtube.com/watch?v=nQRunV2pBVU