Little bit out-dated but shows the main usage: https://github.com/BIM-Tools/SketchUp-BIM-Tools/blob/wiki/ProjectHome.md

Release Notes for BIM-Tools

0.14.0 Better openings, speed and stability improvements - openings(cutting components) now still cut holes when overlapping and on/over the face edges - Speed improvements by replacing individual "addface" calls with "fillfrom_mesh" - Stability improvements because of better use of observers. - Removed the GUID field from the menu because it doesn't match the IFC export GUID - fix side-faces normal direction in openings

0.13.4 It's now running on Mac (menu layout needs some more work).

0.13.3 Fix for SU8. Partial fix for SU7: Auto-updating of modified objects does not work on SU7 because the "EntitiesObserver.onElementModified" method was added in SU8.

0.13.2 Improved monitoring of objects, feels much more solid! Improved switching models without re-starting SketchUp Improved undo Fixed "reversed"-corners in flipped faces

0.13.0 Support for imperial units! Thanks to the re-built menu (based on SKUI) it's finally possible to work in inches. I removed the built-in IFC exporter for now and added some classifications for working with the official SU PRO IFC exporter. I made some rather big changes under the hood, so if you encounter any problems, please let me know!