Python Gui interface

I am interested in developing a GUI interface for rdiff-backup. I have 
tried both of the web interfaces and neither one works on a debian based 
system. Rdiffweb gives a 500 on the next page after the  login and 
Minarca is not able to find the .deb to do the install. My one question 
is there an hook in rdiff-backup that is able to show the progress of 
the backup. I understand that rdiff-backup is not interactive and 
doesn't need this functionality, but if it is not available, is there 
anywhere in the program where that information could easily be exposed?

My vision is to provide a first version quickly, that will do local 
backups and then expand the system to provide almost the complete 
functionality of rdiff-backup with a graphical interface.  I see the 
only limitation being an include and an exclude string, not the multiple 
ordered include and excludes that would be available currently.

I have been using rdiff-backup for quite a few years and don't have any 
problem with using is in crontab or the command line, but I feel that 
such a useful piece of software needs to be more accessible to people 
who are not comfortable using the command line or crontab.