We've tried lots of woods, and the ones that you mentioned seeing are the ones that we've had the best results with, so it's why you see them the most. There's also a good bit of Birch, Cherry and Beech.
There were other experiments that were not as successful. We prefer straight grained woods for necks, also dense woods. One glaring failure for a neck wood was Osage Orange, which would not be held by glue. It's possible that modern adhesives or epoxies would not delaminate.
Coco Bolo, while dense, is usually not very straight grained for the length needed in a neck. Its physical properties make it challenging to glue. As a structural part of a neck, it's got 2 strikes against it. I don't remember seeing Coco Bolo or any Rosewood used in an Alembic neck before. I've only been here since 1987, but I also have run across it in the instrument files either.
