Chris, thanks for the video: I tried watching and I got up to the point where you were trimming with the extruded cubes, then bamm the PC totally powered off. Not sure why, but it been happening to me lately with large (long) videos. (anyone a clue why?) I'll try watching again at work. The method you used which I did watch is similar to what I have tried. I just wish there was an alternative way to automatically isolate and delete the overlaps with out re-triangulation.

Quite a different topic but have a look at the bit of code in this post: http://www.sketchucation.com/forums/scf/viewtopic.php?f=180&t=14299 As it walks through the groups and components, I guess you only need to add some code to count the faces and edges of each. Outputting to a webdialog would be good so that you could use some javascript to list rogues as links so you can identify and fix them one by one*. I would be interested to find out if this approach turns out to be useful. Chris edit: or in batches of same problem

HI ANSSI JUST REACHING OUT HERE...I CANT'MAKE MY ACTIVATION CODE WORK AFTER INSTALLING SKETCHUP5 ON A NEW HARD DRIVE. WHO CAN I CONTACT??? THANK YOU PETER