Re: Shower Pan
I think I'd steer away from tile too, myself.. some minimal fairing and a good nonskid should do the job, but don't make it too harsh since, as a shower obviously people will be barefoot on it.
By the sounds of it the curvature may preclude the removable grid....
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)