After Raspberry camera streaming video project for video streaming i had made , i upgrade it to a new case with a 3.5″ touch screen display, hard disk for video recorfing and a more robust construction. I also install octopi for a later use with my 3d printers.
Display is from ebay and costs 10 euro
Printed parts with hard disk 2.5″
A very nice case from thingiverse
Those are two commands to change
from display to hdmi and vice versa
and a small video with display in action