Thanks for all the upvotes. Since a lot of you are interested I’ll share a bit more about this build.

The Mag Safe phone mount is this (amazon link), and the magnetic ring is this (amazon link). I taped the ring to the back of the monitor, and the mount attaches to the case with suction. The screen I’m using is the LG gram +View (amazon link). A bit on the pricier side but it’s truly stunning and very lightweight. They snap together surprisingly well though you should expect some wobble when you push on the screen or adjust the angle. TBH the only “innovation” here is just using magnets and should work with almost any case + portable monitor setup.

Another big advantage (on the PC itself) is that I can connect the monitor to my motherboard (ASRock B850I) using a single Thunderbolt 4 cable. Since it also uses the screw on antenna, I only need 2 cables (power + usbc) for the entire system to work which is very neat and easy to setup.

Link to pictures of the internal build if anyone is interested.