The custom build:
- Keyboard: Eternal Keypad
- Controller: nice!nano for wireless build
- Case: Carbon Fiber and Clear Acrylic
- Key switches: Kailh White Box
- Keycap: NuPhy MX Keycap
The pre-built keypad is available in https://shop.beekeeb.com/product/pre-soldered-eternal-keypad/
You can get the NuPhy PBT keycap as a bundle kit from the link above or buy it from NuPhy Online Store directly.