if you want to work on a new frontend you might want to have a look at the code i'am currently writing. It is the frontend that we have planned for a 3.0 release and is completely rewritten from scratch the last half of a year. The framework is finished about 90% and completely object oriented. Im currently implementing the visual form editor and the new plugin interface.
I will make a SVN repository for the code and send you the Password so you may have a look at it if you want.