VisuHole is a plugin for Sketchup dedicated to drilling and extruding shapes on surfaces and solids. It supports Drilling, Stamping, Punching, Carving, Embossing with various options. VisuHole can drill across several groups and components and works on planar and curved surfaces. Published on Sketchucation (free registration) at sketchucation.com/forums/viewtopic.php?f=323&t=59165