Wonder if this Access Stage 3 rectangular case would work? I had one of these for a Pomeroy A that I had years ago and really liked it - the internal...
Another vote for the TC Electronics Polytune or Unitune here - I've been using them for a few years now for mandolin, tenor banjo and guitar and love...
I think it depends on the finish of the mandolin - I do tend to like gold on sunburst instruments, though that said, I have a "cremona-burst" finish...