TL;DR: The Corsair MAKR 75 Barebones Keyboard Kit targets the DIY market with easy customization via the CORSAIR Web Hub, eliminating the need for iCUE. It features 8K hyper-polling, hot-swappable ...
Another way you can build your own keyboard is by getting a barebone mechanical keyboard, slapping switches and keycaps onto it (or getting one that includes switches and keycaps), and then modding it ...