I recently built an awesome enclosure from a new company in France (https://www.printer-box.com/ ). The built-in case for RPI4 accommodates a 3.5β LCD, but Iβve been using a 7β screen.
This mount installs in place of the 3.5β screen, using the existing retention hardware. Cables pass through the bottom side. Seal the hole into the box with a piece of high density foam.
The mount has holes to mount the screen, while I used the 7β (https://www.raspberrypi.org/products/raspberry-pi-touch-display/) any panel with RPI mounting holes may work.
Bezel for the LCD is not included but there are a ton of STLs available to choose from.
Easy print, no supports or raft should be necessary.
The author hasn't provided the model origin yet.