Step 4: Finished up
Trace the FSRs shape and transfer to double-sided foam tape, and cut them out to shape.
Remove one side of the protective plastic from the cutout foam tape.
Stick the cutout foam tape to the case, underneath the FSR.
Remove the protective plastic from the foam tape. And press the FSR to the foam tape. (See picture 3)
Repeat the above steps for the rest of the FSR.
Stick the bumpers to the four corners of the case. These bumpers protecting FSRs from touching the surface.
And it's done! Hardware is ready!