Does anyone has any idea how to create own custom dynamic layout for Panels3? What I mean by dynamic is that I want to create 1x2 grid and have an ability to add new rows with "Add new row" button. I know there is a Flexible layout, but it's too complex. I'd like to have a simple flexible layout solution.
I've invesigated flexible.inc file which is the one responsible for Builder -> Flexible and it's really head blowing.