I have only built the Autumn 39 and Spring 41 set-ups. I have not heard of other custom ones being built. I have thought about a Spring or a Summer 43 start for a shorter game - before the Allies invade Italy and before Kursk. It would perhaps be a fun scenario for both sides to play out the last 9-10 turns. Spring 43 would maybe give people a little more flexibility than Summer 43. I think a Summer 43 would lock people into Kursk and Sicily - while if it was a Spring 43 start, there would be a little room to do things different if one wanted to.