I just finished up a new TOS tric build. As these were softer pull shells I got the idea that if I sprayed these with plastic dip I could simulate a leatherette. Not perfect but I'm happy with the results. I guess this is a somewhat idealized leatherette version.
I had a few clear LEDs. I painted those with translucent paint to get the colors I needed.
I ordered brass wire mesh to use for the speaker. Very happy with the way that turned out.
I had a lot of fun with this build. I decided not to sweat every little detail and just try to capture the general look and feel of a leatherette.
Both of my tricorder builds to date, studio leatherette and Wah Chang versions.