Sadek Baroudi (fingerpunch.xyz) designed a monoblock case for his otherwise true split Ximi PCB. The case has a fixed 10 degree tenting.
So, I love unibodies, but I feel like I'm missing out sometimes in that you can't easily tent them… – Sadek Baroudi.
The Ximi supports dual trackballs / trackpad, so Sadek wired up the left half to a breakout board with a mount for a 57mm trackball, and used Amoeba royales single-key PCBs to wire up the extra mouse keys below the trackball.
As the author points out, with so many split keyboard PCBs out there, you can do this with any of them with a bit of 3D modeling.
Resources
This case (and a few variants) are all available here.
This exact case is comprised of these stls: 1, 2, 3.