$35×3
CORSAIR LL Series, LL120 RGB, 120mm RGB LED Fan, Single
*/B07LF75PJ8/ref=cm_sw_r_other_apa_i_oHJjEb4AYWZ8N
$99×2
CORSAIR VENGEANCE RGB PRO 16GB (2x8GB) DDR4
*/B07D5SN1ZK/ref=cm_sw_r_other_apa_i_nIJjEb0023F2X
$136
CORSAIR RMX White Series, RM750x, 750 Watt
*/B073H3QPJW/ref=cm_sw_r_other_apa_i_8IJjEb9P87ZHC
$150
MSI MPG Z390M Gaming Edge AC LGA1151
*/B07HM753YS/ref=cm_sw_r_other_apa_i_ZJJjEbQ1Z335X
$394
Intel Core i7-9700F Desktop Processor 8 Core Up to 4.7 ghz
*/B07S8DWXT3/ref=cm_sw_r_other_apa_i_UNJjEb3KCCKRN
$450
GIGABYTE GeForce RTX 2070 GAMING OC WHITE 8G
*/B07JBPSLSY/ref=cm_sw_r_other_apa_i_JOJjEbNN5ZRE5
$199
Samsung 970 EVO Plus SSD 1TB - M.2 NVMe Interface

$139
Thermaltake Core P3 ATX
*/B07BFGYLJZ/ref=cm_sw_r_other_apa_i_FRJjEb7YSGA99
$154
Thermaltake Pacific DIY LCS PR15-D5 200ml 5-Speed
*/B06XWX5CJ5/ref=cm_sw_r_other_apa_i_5RJjEbQ0QMCE5
$99
EKWB EK-Velocity CPU Waterblock
*/B07H9KXVRV/ref=cm_sw_r_other_apa_i_KSJjEbX780HFY

$104
EKWB EK-CoolStream PE 360 Radiator, Triple, Black
*/B00SNLFF7G/ref=cm_sw_r_other_apa_i_7SJjEbEKCF8EA

~$180 in varius EKWB fittings

~$2,300 total parts ( lots of work with custom water loop)

Yours for $1,800.