Oh dear!! I was planning to use one to make an alicorn. Am I going to be able to take the head/tail off without ruining her?
From what I remember, you're not going to be able to change her tail without some destruction involved. That doesn't mean you have to remove everything, the custom I did still has her wings (see my avatar), but she won't be as sturdy. Customs just aren't, though, so that shouldn't be much of an issue.