I have gib problems with my PM940M-CNC and may have to make all of mine over. The Z-axis gib is too small and too short. In the mill case these gibs are trapezoids and taper in both width and thickness. Its thickness along the ~12.5" length varies from about 0.4" to about 0.3" but I figure is about .005+- too thin. I measured it pretty well and the thickness taper/slope is right at 0.0087 +- inch/inch slope. The width is currently incorrect, especially at the small end, and the locking screw head does not reach the gib at all, but slides up along side of it to pinch the gib into the way binding. So effectively not acting like a gib at all, but as a saddle lock. I have worked around this for now, but it has to go. Nevertheless, its width is about 1" and varies about 0.1 over the length. The diagonal of the trapezoid varies even more as it is larger. I have thought of more than one approach to making this trapezoid on thin material, but maybe you have a better way. Clamping is always a concern.
Can you point me to a description of how you might have proceeded to make yours? Thanks.