I would just sew them together adding small bits of fabric where needed. These blocks were bade in a time where perfection wasn't expected and the tools to make them so weren't available. Sometimes we put too much importance on the straight line. The woman who made the blocks did the best she could with what she had available to her at the time. The wonkyness will add to the character of the quilt. I wonder why we use factory made as a standard for hand made. If you look at vintage quilts you don't see exactly straight lines, matching colors, and other perfection requirements. You see the love and hard work that went into the quilt because it was to be used to keep the cold out.