These are the triggers I made to utilize the extra tom and cymbal inputs on my Command Mesh Kit.
I used prewired pressure sensitive 1.250" triggers that I ordered off of Amazon. A five pack was like 10 bucks CAD. I also ordered a ten pack of dual pole inputs for about the same price.
The base is made from 1\8" steel and the shells are made out of 4" muffler tube. I used a standard 1.5" rack mount. The inside is made with a 2" car wash sponge with the lowest density I could find. I epoxied the trigger to an aluminum disk cut just small enough to NOT touch the sides of the shells. The skin is made from a high density foam mouse pad, and everything is spray glued together, which keeps it together but also allows easy tear down if I have to replace a component.
They work really well so far, small enough to fit anywhere on the kit but big enough to not miss strokes. I mainly use them to trigger song starts or sound effect samples. The pressure sensitive triggers come in handy when I do want to use them for a temporary drum or cymbal. I have had no issues with crosstalk, but did have to set the volume setting in the module a little higher than normal, assuming the unknown quality of the triggers may be the reason for this.