I’ve never come across msv in a shower enclosure before. I advised the buyer of the good chance of mildew or mold growth since it would be tough to clean and dry with all the openings and flat edges. Also possible moisture damage, depending how it was installed and what’s behind it.
My reference for the msv: http://ncma-br.org/pdfs/masterlibrary/MVMA%20Installation%20Guide%204th%20Edition%20web.pdf
- link courtesy of badair