Kaby lake officially supports ddr3L 1333/1600 MHz https://ark.intel.com/products/97128/Intel-Core-i7-7700-Processor-8M-Cache-up-to-4_20-GHz
I am in the process of building the exact same pc, can you share a picture of your cable management and how it looks under the psu shroud? Any complaints about the motherboard or powersupply?
That mobo support up to 1600mhz ram, so no need for 1866. Other that that its solid, I hate Razer but thats personal preference.
The motherboard in your list uses DDR3 RAM despite being for a skylake processor. Here is the DDR4 variant of the same asrock motherboard http://pcpartpicker.com/part/asrock-motherboard-fatal1tyz170gamingk4