Speaking of the CEP tails. There are some tails added as a pelvis model, while this solution made sense pre 1.69, it doesn't now.
For example I have an item that allows players to add tail. However the tail selection is limited and doesn't contain for example the wolf tail from one of the pelvises. On the contrary the tail from pelvis is "free" making my item quite a worthless.
Wouldn't be better to get rid of the pelvis-method-tails and move them into standalone model usable as a creature tail? Sure there are issues like horses which uses tail, so normal tail isn't visible, but who knows how this behaves with pelvis tail?