Doing first DIY audio project, need suggestions

Hello, I am building a compact desk audio interface. This is my first DIY audio project. Planning to print the outer shell with my 3d printer and get the electronic components online. It is a minimal budget project that serves as a single 6.5mm input jack audio interface for my guitar. I am trying to make it powered by a usb c type and a 3.5mm output. Would also like to implement a small screen as a visualizer for aesthetics. This will also serve as an academic project of mine (Industrial Design) as a portable audio interface solution.