This is an early version of the board that I created because I was irritated by the fact that there were no shields available for the ProMini. It includes the ability to plug in one of those cheap, Chinese breadboard power supply boards and I stuck a DS1307 real time clock under it. The ProMini goes in the center then you can plug regular UNO shields into the carrier. These things worked well but I decided to make a bunch of shields specifically for the ProMini.