The Corne Engineer keyboard case is made from frosted acrylic. Each case includes screws, standoffs, and glass green top plates. The middle layers are cut from a single sheet of 9mm frosted acrylic. If gray tinted top plates are preferred, just add a comment during checkout.
Kailh Choc switches are somewhat compatible. More detailed information about the fit of low profile switches on acrylic cases can be found in the FAQ.