Standoffs: someone already linked you.

The 180 degree adapters… if you get them, get the ones with the cap. Looks MUCH nicer. Amazon comes in and out of stock but its also available on AliExpresss. You don’t NEED them. It’s an aesthetic choice.

ATX 8Pin Female to 8pin Male 180 Degree Angled Adapter for Desktops Graphics Card Upgrade Version https://www.amazon.com/dp/B08F7G7C4G/ref=cm_sw_r_cp_api_glt_fabc_KVBS456GMCSMZJRFMCBX?_encoding=UTF8&psc=1

I just used the stock sf750 cables. I removed the daisy chain and I changed the connector and the pin out of one of the cpu cables and converted it into a pci-e cable.

P14’s are good and they do sell em individually.

ARCTIC P14 PWM PST - 140 mm Case Fan with PWM Sharing Technology (PST), Pressure-optimised, Very Quiet Motor, Computer, Fan Speed: 200-1700 RPM - Black https://www.amazon.com/dp/B07GZJY4TM/ref=cm_sw_r_cp_api_glt_fabc_HMMCACRBQBVM9DGFHG9N?psc=1

ARCTIC P14 PWM PST - 140 mm Case Fan with PWM Sharing Technology (PST), Pressure-optimised, Very Quiet Motor, Computer, Fan Speed: 200-1700 RPM - White/White https://www.amazon.com/dp/B08QNCNTKB/ref=cm_sw_r_cp_api_glt_fabc_E4JCB163FZ4KXHFX7A51?psc=1

NVME… if you want to add a rear nvme and you want the ability to remove it without removing the mobo, you need the mobo standoffs. I’m not sure if you can do both the mobo and gpu standoff mods and make the nzxt aio fit.

Hope that helps.