Sketchup Tutorial
Hole Punch Plugin for Sketchup
Hole Punch adds a new tool for glued/cutting component-instances that allows them to punch linked 3D holes through the faces of double-skinned walls/roofs etc. It is accessed through the right-click context-menu 'Hole Punching...' sub-menu, which offers various items depending on the current Selection.
Download: www.sketchucation.com