I've seen this done before on a few mods. For example, the Dragon Mount mod has this functioning in the neck and tails of the dragon models. A better example would be the model of the Taintacle from the Thaumcraft mod collection. I'm currently trying to make a mob that has a similar spine-like feature and I know it will take layering bones in some way. So far though, I can't seem to find the option in Blockbench or Cubik Studio to make this happen. Anyone have an idea? If it can't be done in either of those softwares, what software might do this? If there is a software, what does it take to put this together? I appreciate any feedback!