I cannot comment on the noise of the Kailh browns at the moment as the board has been giving me some grief and I am waiting on new Elite-C controllers from Omega Keys. The keycaps came from ChocFox, the PCBs were ordered directly from JLCPCB using Foostans design, everything else was mainly through amazon. As for the acrylic, I have my own CO2 laser and just cut them out of 1.5mm clear, also from Foostans GitHub repository.
There are several good tutorials out there with parts lists and the build process, Marek Piechut has a good one called Corne MX 3.0 Keyboard Build Guide.
I wanted something super thin so soldered the controller to the board, I do not suggest this as I had some errors on my part and destroyed the controller, thus I'm waiting for two new ones before I can use the board, until then I'm stuck with my hand wired dactyl manuforms.
Just make sure you know what board and keycaps you want, sounds like the Corne chocolate to me, and pay close attention to the LEDs if you go that route, I have 600 that are of no use to me and am waiting on the proper ones.
Other than that have fun and there are plenty of people willing to offer help and advice between here and Discord.