Not trying to talk you out of it. It is an amazing sculpt and a great pain application. Love the intimidating stance. They got an awful lot right with this piece.
Again, I have my own considerations. When my stuff gets crated and shipped back, seeing it 2-3 months later, it will have been subject to a variety of temperature and atmospheric changes. That fiberglass base, if it has any flaws will be susceptible to breaking down in ways that stone would not. It may handle blunt forces better, but it most definitely will not be as durable over time if left to its own devices.
Either way, the ship has sailed on this. It is however creating new considerations for me on other pieces, based on the materials used and my own unique set of circumstances. YMMV.