I used Lister's acrylic plate design and converted it to be 2 piece CNC machined case. Bottom case will start at the switch plate and continue to the desk, it will have cutouts for Teensy and pocket for PCB like in Lister's design.
Top case will only have pockets for Teensy and connectors and cutout for the keys.
Here's screenshot from CamBam. I'm going to cut it on Saturday since I'm busy with work over the week.
For now I'm going to use some wood or MDF but the goal is to have it cut out of Aluminium and anodised.
The other option is powder painting. In this case 2 pieces screwed or bolted together will appear like one piece.
Honestly this keyboard in decent case, either anodised or painted red will look like sex
I'm attaching CamBam files. You can download trial version of it (limited to 40 uses) for free to view them.