While it is styled after a Jetson-like design - in my opinion it is rather crudely formed. Lacking any artist association - it looks like someone's early work.
The size doesn't really come into the valuation until the marble, its design and the artist's execution "is there". IMO - that is lacking in the piece. With no artist association - IME the size doesn't become much of a factor.
Of course you might find a person who falls in love with it and doesn't care about these things. In that case - its just a matter of agreeing on price.