My main concern is that the project produce something good enough, even if not 'perfect' and 'complete', to commit before 3.6.0 beta 1, scheduled 09-07 https://www.python.org/dev/peps/pep-0494/.  I would actually like to have a preliminary version in alpha 4 (08-08) or even alpha 3 (07-11).  It would be good to get user feedback before the summer is over.  I will try to document the GUI in such a way that the detailed layout and operation are not locked in, but can be amended and augmented.

For style, follow PEP 8.  Ask any questions about alternatives and ambiguities here.