Now that I've narrowed down a direction, this thread is for commentary. Rules:
We're going with vertical tabs.
We're going with the summary above, edit area below.
There are only two actual steps for creation.
I'm already working on the implementation.
The WIKI is here: http://groups.drupal.org/node/8428 -- it may be edited to include things we know or like and wish to pursue. For speculative commentary, please put it in this thread.