nice tutorial tbg. I've been editing the actual .xml file to change max iterations on progressive settings.. your way is much easier 
Have your tried exporting to Kerky after creating the .tweens file? I used su2kt's batch scene export and got it over fine but the resolution doesn't hold. It ends up being about 200x200 every time. Maybe it's something I overlooked. I'm pretty sure I've been choosing the 'match scene resolution' option from the export dialog.
youdaman! 
Sketchup stock just jumped 10 points! Here's a quick one exported from Sketchup, animating 4 levels deep. I'll post a rendered version later on. Thanks again!
[flash=400,225:2kxqbjh1]http://vimeo.com/moogaloop.swf?clip_id=22511394&server=vimeo.com&show_title=1&show_byline=1&show_portrait=1&color=00ADEF&fullscreen=1&autoplay=0&loop=0[/flash:2kxqbjh1]
Hi! I need to start off by saying this is just fantastic work man. The hard work of persistent developers like yourself is what keeps my interest and use of SketchUp going every day.
Are you aware of or encountered any file size limitations when generating the tween scenes? I have this model that I previously animated with Proper and then rendered with Twilight. It's not complex at all really, but it's just over 20MB with all components included. I downloaded Keyframe and recreated what I did with Proper; ended up being 7 scenes. When I went to create the tweens I never got the dialog that asks for confirmation to create x number of scenes. However, the 'model.tweens.skp' file was created, just without any scenes included. At first I suspected there might be a limitation on the number of scenes SketchUp can create so I dialed the frame rate down from 24 to 10 and retried but got the same result. Then I tried creating a fraction of the animation with only two scenes and again got the same result. The next obvious thing to do was to try and strip the model down so I deleted the majority of the components and got rid of 15 of 20MB. The next attempt at creating the tweens was successful, as you can see in the video below, yet the focus of the animation is missing (items inside of case).
[flash=400,300:20oxahao]http://vimeo.com/moogaloop.swf?clip_id=22483626&server=vimeo.com&show_title=1&show_byline=1&show_portrait=1&color=00ADEF&fullscreen=1&autoplay=0&loop=0[/flash:20oxahao]
I would have said "oh well' but I really really want to use your plugin to get object/camera animations out of SU and into Kerkythea. Twilight is awesome but it's painfully slow due to what I'm guessing is the 32-bit architecture it relies on.
Any help would be greatly appreciated. Thanks!