I figured the easiest way to get started was to build a box using acrylic panels which are connected with corner pieces I could 3D print. This was a fairly easy process. I cut some acrylic into the sides of a 250x500mm box, put together a design in Sketchup and then drilled and screwed it all together. The hinges come from a design I found on Thingiverse by DarkDragonWing which I scaled up to double the size. The nice thing about this hinge design is that the door can close flat against the front instead of needing a gap at the hinge side to clear the axis it rotates on, and the curved shape looks pretty nice in my opinion.

This actually turned out so well I wanted to cancel the whole idea and keep the display case for my lounge, but I kept going.

The idea from here is to have tray slots in the sides that a simple flat piece of acrylic can slide into making sure to leave a bit of clearance for cables on the sides and still have some airflow. I didn't really consider airflow and connections at this point because that can be addressed later.