I just placed an order for the revision B of AmiKey! Only minor tweaks were needed, such as moving a few holes in the PCB to better fit the keyboard backplate, moving several tracks away from holes, and the pads are now slightly larger and slightly shifted to more closely match the original foil membranes. I have several damaged membranes to test against, and they all have slight differences in both size and placement of the pads and holes. Really slight, maybe tenths of a millimeter, but they aren’t exactly the same. I had to approximate placement of few holes and pads, hope they’ll fit perfectly this time.
The PCBs should arrive in about two weeks and this time they will be gold plated. Hopefully everything will be fine and revision C will be the production version with a final decision to go with either 0.4 or 0.6mm PCB thickness.