#1Pages 1, 7, Step 15affects: Copies before 1/14/2023
Block dimensions on pages 1 & 7 should read 8 1/2" x 12"; below Piece B it should say trim the remnant into (1) 2 3/4" x 12"; at the end of Step 15 one L piece needs trimming to 8" for the 13th unit.
Official — designer correction see the source ↗