This is for those of you who are building an Apple II replacement keyboard from the unified keyboard project.
The good news is that once the mounting holes are adjusted, the keyboard fits great and looks and works really nice. I will describe the problem and how to fix it with a little filing.
The problem is that when I measured the fit of the keyboard, I placed the board against the mounting screw holes in the case. However, I assumed that the screws were perpendicular to the case, and did not realize that the screws were actually parallel to gravity. When the spacers are added in, this changes (narrows) the distance between the mounting points on the keyboard.
This means the holes are not properly aligned. The right upper slot (viewed from the point of view of a typist at the keyboard) is OK. The two left-side slots and the right lower slot are off. Of course they will be adjusted in the next revision.
The first step is to mount the standoffs in the holes, and position the keyboard so the keys are properly centered in the case. Then use a sharpie to mark the areas where the screws need to be positioned.
Next, file away the PCB material to make room for the screws:
Now the keyboard can be mounted to the spacers:
The power light here looks red, but that's a camera artifact. The power light is actually an amber color. Here's a keyboard test