New Lumos for my 13yo

Chassis Model: Digital Storm Lumos
Exterior Finish: - Standard Factory Finish
Trim Accents: - Standard Factory Finish
Processor: Intel Core i7-8086K (5.0 GHz Turbo) (Limited Edition) (6-Core) 4.0 GHz
Motherboard: ASUS ROG Maximus XI Hero (Wi-Fi) (Intel Z390 Chipset) (Up to 3x PCI-E Devices)
System Memory: 16GB DDR4 3000MHz Corsair Vengeance RGB Pro (RGB Light Bar)
Power Supply: 750W Corsair RM750x (Fully Modular)
Expansion Bay: - No Thanks
Optical Drive: - No Thanks
Storage Set 1: 1x SSD M.2 (500GB Digital Storm M.2 Performance Series)
Storage Set 2: 1x Storage (3TB Seagate / Toshiba)
Storage Set 3: - No Thanks
RAID Config: - No Thanks
RAID Card: - No Thanks
Internet Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections)
Graphics Card(s): 1x GeForce GTX 1070 8GB (VR Ready)
Sound Card: Integrated Motherboard Audio
HPC Processor: - No Thanks
Extreme Cooling: H20: Stage 2: Corsair H110i GT - 280mm Liquid CPU Cooler (Fully Sealed + No Maintenance)
HydroLux Tubing Style: - Not Applicable, I do not have a custom HydroLux liquid cooling system selected
HydroLux Fluid Color: - Not Applicable, I do not have a custom HydroLux liquid cooling system selected
Cable Management: Exotic Cable Management - White - (Cable Combs with Custom Color Sleeved Extension Cables)
Chassis Fans: Corsair LL Series (RGB Fans) (Software Controlled Effects) <br><strong></strong>
Internal Lighting: Remote Controlled Advanced LED Lighting System (Multiple RGB Color Modes)
Airflow Control: - No Thanks
Chassis Mods: - No Thanks
Noise Reduction: - No Thanks
LaserMark: Option Not Available
Boost Processor: Stage 1: Overclock CPU - Up to 4.7GHz on All CPU Cores <br><strong></strong>
Boost Graphics Card(s): Yes, Overclock the video card(s) as much as possible with complete stability <br><strong></strong>
Boost OS: - No Thanks, Please do not tweak the services on the operating system
Windows OS: Microsoft Windows 10 Home (64-Bit Edition)
Recovery Tools: USB Drive - Windows 10 Installation (Format and Clean Install)
Virus Protection: Windows Defender Antivirus (Built-in to Windows 10)

Is this ok? Using for gaming primarily. Thanks.

SnowandSand raises some interesting options. I, too am not a big fan of overclocking video cards, the results in performance just aren't that great. You don't mention if you'd like some help with your budget. The i7 8086 is not a problem on that cooler, but the i5 9600K would be powerful enough with the bonuses of running cooler at a decent savings.

It would be helpful if you told us what resolution your son's monitor is. That determines the video power you'll need. Assuming you have determined that, I'd point out that your motherboard choice is a bit of overkill for the rest of your build. I would strongly encourage you to change to the MSI Z370 Gaming Pro Carbon which would free up the needed cash for the Samsung 970 Pro NVMe for your primary drive. It is many times faster than the DS M.2 which uses the SATA bus. The difference there will be something that enhances the experience constantly whereas the motherboard difference is something you'd be unlikely to need.

Hope it helps you.