Well, here it is. The harpy now has a base to sit on, which is a major improvement. The shape and weight distribution of the head mean that it can't stand up on its own, and needs a base to support it.
Another advantage of mounting the harpy on a base is that it prevents the crest of feathers at the back of the sculpture's head from getting squashed. The crest looks much better displayed this way.
Originally I was going to put a quote from Aeschylus' Eumenides around the base, but sometimes less is more and I decided it looks better as it is.