Shower parts arrived and I got them installed today. Used stainless screws this time around. It appears the builder (Four Winds) either scrimped in this area or stainless screws were not available back in 2004.
The fun part of this build is the lack of effort that I have to exert to produce a "better than stock" finish. Four Winds didn't set the bar very high with their quality, either in the parts they used or in workmanship they applied.
And this quality standard (or lack thereof) doesn't end in the bathroom, it extends throughout every aspect of the couch. Look behind power outlets and the hole looks like it was cut with a chisel. Bracing behind drawers is made from whatever was handy. Etc, etc. The only "standard" that I've found so far, is they used the same size screws (Robertson?) to attach just about everything in the coach. Sure makes it very easy to remove/replace everything.
Anyhow, below is a before and after pic of the shower now that its been refinished and the new faucets installed.