Diy A Frame Trellis . Side a (the angled side) 2. The middle horizontal piece of wood serves as structural support for the wide design, as. How to Build a Bean Teepee Frame The Everyday Home Bean teepee from www.pinterest.com A cage trellis perfect for tomatoes and dahlias alike; Check out our newest diy trellis design below! A trellis is a landscaping structure you can add to your fruit or veggie garden to help your climbing plants thrive.