在python中构建一个带有轨道和时间轴的前端

I'm looking for a solution to create a front-end in python for an app. I've some experience with Tk (but it's not fundamental i would like to use wxpython) and standard widget, but now i'm in a project too complicated for me. The app is like a multimedia presentation builder or scheduler, where the elements i can use are pictures, videos, sounds, and other as command to execute something and where i decide when to start to view each element. I've not found any standard widget to use, so i've made a mockup of the interface that is similar to the multitrack audio or video editor,I'm looking for a solution to create a front-en