I recently built an ergonomic mechanical keyboad using the parts below:

• Main kit: aluminum case, hotswap PCBs and USB-C cable from YMDK
• Tactile Brown Kailh Box Switches for most of the key from Flashquark
• Linear, clicky Gold Kailh speed switches for arrows, esc, enter, space, etc from Flashquark
• SA Retro Beige Dyesub PBT Keycaps from Flashquark
• Accent SA keycaps came as part of PimpMyKeyboard’s grab bag
• QMK configurator for customizing layout