I personally don't like the 2u blocker like the one done on Think6.5, but besides that, the design looks clean.
Here are a few errors that I can see
1. From the back image, there are two bumps on the side of the bottom piece that would make this impossible to machine. I think you'll see it if you look a bit closer at the bottom half of the case
2. Its possible that I'm just seeing things wrong, but the usb port is way too high. The PCB should be 5mm(or something around there?) below the plate. From the images, it looks like its 2-3mm below the plate. Make sure those measurements are correct. That will also affect the overall height of the bottom piece
Looking forward to further developments on this project!