What we need??
Plastic plate, Piezo, Sandpaper (and or anything we can use for plating), Glue (and or anything we can use to stick), Paint (or anything for coloring), Solder and friend, Drill (or anything we can use for holling), etc.
For full detail check my blog How to Make DIY eCymbal Pads from Plastic Plate for Electronic Drums
Step 1: Choose Your Plate
Choose your plate that suitable you need. Then use sand paper or anything to make the emboss flaten.
Step 2: Holing
Use drill or anything to make the hole for cymbal stand/holder. If the cymbals anti-spin (rotation stopper)needed, then drill other hole for the anti-spin.
Step 3: Layering the Plate
Use any kind of rubber such as mas, car food pad, mouse pad, varnished, etc. the cut it to layering the plate. Use glue to stick the mat to the plate.
Step 4: Coloring
Coloring your cymbal if needed.
Step 5: The Piezo
Choose your piezo size. Soldering and connect it to female jack, or directly to male jack.
Step 6: Stick Them
Stick your piezo to a rasher mat, then stick them to the plate.