I was just reviewing the build document I uploaded and realized the version of Windows I listed was the dvd version.
You will need the usb media version.
The version I selected from PLE was the only Windows 10 Pro version they had, so you may have to find your OS from another source.
Here is a link to a pricing website for Australian retailers for the usb version of Windows 10 Pro.
https://www.shopbot.com.au/pp-microsoft-windows-10-pro-3264bit-retail-usb-price-523272.html
The prices listed are actually cheaper anyway.
Other than that the only other part I’m having second thoughts on is the case. I think the case will suite your aesthetic, but the rgb will have a separate control from the cooler and memory so it adds an extra degree of difficulty when you want to synchronize your color scheme.
Here is the Corsair case from PLE: Corsair iCue 465X RGB Smart White Mid Tower Case
The price is identical to the one on the uploaded list.
The only reason I didn’t choose it from the start is it has a glass front which will inhibit the airflow somewhat and reduce the cooling effectiveness of the front fans. It has gaps around the edges of the front for airflow, but tests have shown its not as efficient as a direct uninhibited intake from the front. Though it should be good enough for your purposes. The cooler I previously selected should still work with this case. In both cases you would keep the default fan configuration and install the radiator and fans in the top mount. Your assembly technician should be able to figure that out.
If you get a Corsair case with iCue rgb control then it will all be controlled form the same application and synchronized. Then in the future if you need another keyboard I would recommend Corsair K95 and it will all be unified. I use the K95 myself and have the colors set to identify different key groups, and across the top there is a band of LEDs that I have set to the temperatures of the cpu cores and gpu so a they heat up the LEDS change from blue to show they are cool then progressively goes yellow, orange then red as they heats up.