I think it will dry in a few days over the shell mold, but it will be very fragile so handle with care. I would dry it on the outside of the mold and when it is firmly set remove and slide it inside the mold so it dries on both sides and keeps it’s shape. Not sure how you plan to light it but am anxious to see the finished cake. You can roll out 2 lbs of gumpaste to a 14" piece but you might want to knead a tiny bit of shortening to the gumpaste first.
Shirley
