Hotgrove,
Thanks for the pointers.
If anyone is interested, I believe the Ish6 windows used are '<kuid2:58223:25099:1> Marsz-I Kit x v403 (Glass Panel)'. There's a series of such windows, both vertical and horizontal orientations, with 1 to 4 panels; the KUID I listed is the 2-panel vertical variety. They appear in the Surveyor Objects tab (static, not splines), and measure 50 meters long by 10 meters high (vertical) / wide (horizontal). Thanks, Ish!
Many thanks also to 'euromodeller' for all of their fine MR assets.
Regards,
Mike