They are watertight and ready for printing/milling. Although there are some slight undercuts, they were created with molding and casting in mind.
Version with background inlcudes a highpoly OBJ (around 3.5 Mil polys) and a decimated, optimized STL (1 Mil polys)
Version without background: 96 mm tall / 342 mm wide/ 13.8 mm deep