Make your own keypads

you can make own keypads using following steps.
or alternatively, if can add 10 hours bob's day , enough interest maybe can convince him come 1 or 2 diy kits.

see: attached schematic of components needed.
i used aluminum foil duct tape home depot.

#1   (overlay) design whatever keypad layout need. use sketchup this.
      make sure overlay matches pcb keypad pattern.
      print on 24 pound paper , laminate both sides.
#2  (mask) make similar layout in #1.  
      place centered 1/4 inch circles in key pad. print on 110 pound card stock paper.  
      put 2 pieces of 110 pound paper behind mask, punch out circles in each keypad.
#3   make pcb using pattern similar 1 or 1 in image #4 (i used #3 pattern)
#5   place punched out mask on pcb (here made mask out of plastic , cut out openings on cnc)
#6   stick aluminum foil duct tape on of overlay in #1

workings:
the mask gives access each keypad, in case 8x8.  
the overlay aluminum foil matched pcb push on key make electrical connection on traces keypad.
since there no tactile feedback, used sonalert beep each time key pressed.

edit:
you may want consider cutting individual aluminum foils each button, however, 1 solid strip works 100% single button push detection.

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