Rigidity can be an issue with things like gun stocks on a rotary axis. Sometimes fixtures and multiple operations are a better choice.
Again, rigidity can be an issue. I have a friend that has a business making acoustic necks, and they are all done on fixtures.I think it would be better for cutting guitar necks if the neck blank could be rotated.
Does he have a website or YouTube channel, Gerry? I'd like to see what he does unless it's proprietary.