a keyboard mounting project made with a raspberry pi pico switches red low profile gateron and keycaps not too expensive, everything fits with friction but for more tranquility I recommend to put a little hot glue, the two parts of the keyboard sound connect with a cable vga which allows to have only one raspberry.

if need I can send the code or info about the assembly shéma, everything is soldered by hand so there is no pcb.

diodes:
https://fr.aliexpress.com/item/1005005757979567.html?spm=a2g0o.order_list.order_list_main.4.70e75e5bBFdKEv&gatewayAdapt=glo2fra

vga connector:
https://fr.aliexpress.com/item/32824306426.html?spm=a2g0o.order_list.order_list_main.15.69f55e5b0TSoN0&gatewayAdapt=glo2fra

vga cable:
https://www.amazon.fr/dp/B0721SSJJT?psc=1&ref=ppx_yo2ov_dt_b_product_details

switches:
https://www.gateron.com/products/gateron-ks-33-low-profile-switch-set?VariantsId=10265

keycaps:
https://fr.aliexpress.com/item/1005006036204234.html?spm=a2g0o.order_list.order_list_main.25.69f55e5b0TSoN0&gatewayAdapt=glo2fra