an0malaus
Inspired
The Construct prop in the library is not exactly the same as in the Poser 11 factory default scene, where it's called "GROUND", though they do share the same geometry file, hence my suggestion to check the GeomFileName()
Python:
>>> gnd = poser.Scene().Actor('GROUND')
>>> gnd.GeomFileName()
u'/Users/Shared/Poser 11 Content/Runtime/Geometries/Primitives/Construct.obz'
>>>