Fans: Arctic BioniX P120 A-RGB (here); two sets of three fans daisy-chained, first set front intake, second set rear-top exhaust.
Border: any WS2812B-compatible strip; runs along the inner perimeter of the case, recommended at least 60 LEDs per meter, pairs well with a T2016 silicone diffuser (image).
Bracket: customizable acrylic GPU support bracket, commonly available on AliExpress, eBay, and Etsy.
Cable: Lian Li Strimer Plus V2 Triple 8-Pin (here).
GPU: Sapphire TOXIC AMD Radeon RX 6900 XT Air Cooled (here).