Miter 6 planks (only) to length for the set of inside planks for the bench seat. In our plan, there are three planks of three different lengths in each seat section that forms one of the hexagonal sides. The 6 middle planks are longer than the 6 inside planks, and the 6 outside planks are longer than the middle planks--but all three sets of planks must have both ends mitered to 30-degree angles. You will cut/miter the other sets of planks in a later step.
