Does anyone have a best guess at the dark colour on the cabinets? Is is a green or grey....?

My best guess is, unless it is custom blended, it is one of the dark, brooding gray/greens, like B.Moore Ashwood Moss, Southern Vine or Aegean Olive. On the SW line, Rookwood Shutter Green, Rock Bottom, Roycroft Bronze Green, or Urbane Bronze. Hope this helps.