If anyone is still interested in this thread and curved folding, I found this free programme which will fold models. It will only recognise .obj files, but sketchup will export, then you can import it back into sketchup.
Wouldnt it be great to have this sort of plugin for sketchup! 
If only I had Ruby script wizard skills!
http://mitani.cs.tsukuba.ac.jp/ori_ref/ - PROGRAMME DOWNLOAD
http://www.curvedfolding.com/video/ori-ref-demo-video - DEMO VIDEO
Thankyou DreamPSI. Yes, I was able to make the toolbar appear to be active. However, unfortunately this tool is not working with Sketchup Pro 2016. The last version it is compatible with is Sketchup 2013. This is due to some changes in API. Shame really...I was very keen to play with this, as it appears to be just what I need.
Please excuse me if I have missed something. I am excited about this plugin. Downloaded it today and went to use it. Can not
use any tool. Each tool give me the message " Cannot find file LSS_toolbar/pathface.html" I have read the installation instructions and have checked that everything is in correct folder. The same message repeats for each different tool. Thanks.