I’d recommend buying the panel, eDP cable, and driver board from the same seller. I posted my experience doing the same above. Of course you could take a chance with random components and it’ll probably work as long as the connectors match, but why bother when Chinese vendors are willing to do the legwork for you?
You don’t need a 3D printer if you have another way to hold the panel (I glued it to a thin laptop stand)
Yes exactly. You need something to attach the panel to (unless you've got magic to float it in mid air lol). You can repurpose an old canvas/acrylic board, or go fancy with a custom 3d printed case.
Thing is, you could glue the panel to something as people have done. I find that detestable because you can't remove the panel non-distructably. A proper enclosure can hold the panel instead of sticking to it.
You don’t need a 3D printer if you have another way to hold the panel (I glued it to a thin laptop stand)