On the barn shed plans- pg68.... what is the letter "C" wood for? On the 14x24 it calls for 50- 2x4x12s and 13 -2x4x14s.You can combine plans and materials lists to get what you want. The only reason I didn't include a 12x24 is because I had to make the cut off somewhere. You can make any length. I just gave dimensions for the most popular.