I thank you very much for all your information and discussions. I am the person in charge at Innova (
http://www.innova.uned.es) to develop themes for .LRN and I learn a lot from your work. 😊
I started with this job just three weeks ago and during this time I have worked not only on the standard themes but also on Selva, in which I am at this moment developing the CSS for SelvaFlex.
For me it is a good way of understanding a site to sketch its logical and navigation design. And I have made it for .LRN too, gathering its Information Architecture optimum possibilities. It is a little long documentation but I think it can help to develop a very clear and usable theme, in which the .LRN's complexity and dynamism has not to be lost for the final user by a too confused navigation.
You may download it at: http://luther.innova.uned.es/AI_Lrn.zip
(Sorry for the weight of the document¡. As soon as I can I am going to try to make it lighter.)
