Lengthy

Inspired by Owen Kephart's "Threeless #1" posted and featured about a week ago on crossshare. Thought this would be a fun project and modified his fill, adding two 15 letter word spaces. Tried to get down to a 17% fill amount, but ended this attempt at 20% black squares. Might give it ago with a different "theme" as the one in this puzzle is perhaps not the most creative, and could possibly allow for a lower black square %. Thanks!