My friend and I made these End Cheeks in his garage. I spent about $5 on 3mm acrylic sheet plastic and about 30 cents on mounting hardware (size 3 6mm phillips screws and plastic washers).
We basically just drew (on a big piece of paper) the exact dimensions of the Elektrons, and mark EXACTLY where the screw holes need to be. We ripped on test cheeck with a jig saw (use a sharp blade and go slow, and use a guide to help you cut straight). Once we tested the cheek to see if it fit correctly (and it did) we just traced that piece, using it like a template, onto the other sheets of plastic. It was quite easy once we were sure of our measurements.
I then sanded the edges by hand using a Wet/Dry sand paper backed with a block of wood to keep it very flat (you don’t want to have wobbly edges). This was the bulk of the work as it took several hours of sanding to get to be perfect, but you can do it with a power sander if you have one, or just leave the edges raw, or tape them.
A couple things I did was to elevate the machines off of the table surface so I can run cables under them when i need, and so the machine doesn’t get scraped across the table surface. Also make sure that the edges of your plastic cheeks don’t protrude above the face of the machine. You don’t want that sharp plastic edge digging into your hands when you’re getting busy twisting knobs.
Hope that helps encourage some of you guys to try to make some of your own!