It does not have to be square as long as it does not measure any larger than 24 X 24. The Round Robins are really easy...you just add the next round according to the size on the original email...I hope you print it and post it where you can remember where it is...I put my on corkboard right next to my design wall...it helps me remember.
Linda...lovely block and it will be fun to work on.
Kay