Alright, attached I uploaded some more pictures. These pictures show the placement of the touchstone receiver and the small metal discs. Please note that this is, again, not the actual prototype. This time I simply used a left over case I had ordered some time ago. The placement of the small metal discs should be roughly the same as in the prototype. However, the placement depends on the placement of the receiver coil and thus is very likely to vary.

The main reason why I uploaded these pictures is that you get an idea of the inner bits of this mod. Note that I used a small piece of paper to avoid the soldering points where the coil is attached to the receiver logic being short circuit by the internal metal housing. In the actual prototype I also put some paper between the metal foil "shielding" of the receiver and the metal housing.