Thanks. I did some more poking around and it seems like nobody really makes what I want. Or else, I'm too picky, which is a possibility.
I read some reviews of a few other backlit mechanical keyboards and saw that it seems to be common to use clear plastic or translucent ABS, with a black paint or coating over it, and then laser-etched the paint away to make the key legend. This is what my old Saitek Cyborg keyboard had, and every key where my fingernails would make contact with the key (e.g. shift keys, spacebar, C, V, N, M, and a few other keys) had almost all the paint/coating scraped off over time.
As far as a wrist rest goes, I was hoping for something along the lines of the Steelseries 7G, a 1-piece affair, not a detachable rest. I think i might just end up making my own replacement housing/casing with the integrated wrist rest I want.