Working on the keyboard for my DIY word processor, I thought it might be fun to try a custom capacitive key switch. I don't know if this is practical in any sense, but it finally gave me an excuse to use #KiCAD again
Rear solder pads of the plates with through holes
Side, semi-transparent view showing the through hole path to the other side of PCB
3D Front view of annular circles representing the contact plates of the key switch