**BID UPDATE***
Since my original bid below I looked at your project description again. It is difficult to say exactly how much work is involved in your project, because you may have good code mostly complete, or code that is poor and needs to be almost completely overhauled. No way for me to tell until i either chat with you or maybe even see the code.
Just to tell you more about my relationship with Kivy - I am a strong supporter of Kivy. It is a brilliant development in the Python community and I have really delved into the mechanics of it in the past year. In the past year all the GUis of my projects have been implemented in Kivy, and I have worked with almost all the widgets and layouts, and extended a few.
The projects I worked on in the past year include: a cross-platform database application, video surveillance system with some Image recognition done in the background and an Android Game.