You have my comment

For anyone looking for the official suyu project it moved to this gitlab https://gitlab.com/suyu-emu/suyu

This article talks about turning a laptop into a rack mounted computer. Each computer will be different recreating something like this based off what ports it has and where.

12ft.io is a really good site for getting around these kinds of paywalls.

I use the 8bitdo ultimate controller. It is super programmable, the analogue triggers work with dolphin, and it has a nice dock. It has Bluetooth and a 2.4 GHz dongle. 8bitdo also makes a wireless gamecube adapter that connects to an original GC controller. Although I haven’t tested it and it doesn’t mention Linux compatibility