Habpanel with default panel

Exact the same thing that I also need to know. I want to build a Panel, that is always opened b HABpanel, as I only need this panel only and I want to be able to load it from several devices.

How can this default Panel be set up?

And, as a second question here: How can the “code” of my panel be saved? E.g. for using it with git repository?