I can delete The Construct if I have other props or figures in the scene. I can also select not to show it by getting into the menu -Display | Guides | Ground Plane (uncheck this). Or makeit not show via the Hirarchy menu. Or go to Material Room, select the Construct, select Background (that is the material for the skydome), and make that invisible. leave the Ground material visible. That's your "ground plane" in a circular shape.

The reason I like using The Construct is because with Cycles Surfaces and a suitable Cycles shader tree, I can use only the illumination from the skydome and ground, and light up the scene in a natrual manner. I don't need to use any post lights.

Eternal Hobbyist