I got Levinson v2.5 PCBs from keeb.io and PCBs are a bit different from Let's Split, the holes for the mounting standoffs are smaller than the original design of this case. So I got rid of these standoffs and I also got rid of the screw holes on the bottom plates.

Since you won't close the enclosure with screws, you need glue. I recommend cheap B7000 glue, which is used to glue phone screens. It can be disassembled by heating it up. Link for the glue: https://s.click.aliexpress.com/e/_A9PD5j

I made a video building this keyboard: https://www.youtube.com/watch?v=2BzNDQHCyEw