It is watertight and ready for printing/milling. Although there are some slight undercuts, it was created with molding and casting in mind. Nominal size (although easily adjustable in any 3D software) is:
Pendant: 41.33mm wide/ 44.23mm tall / 8.89mm deep
Medallion: 50mm wide/ 50mm tall / 9.38mm deep
If you need any more information about the product, please contact me, thanks.