2x4 sectional outdoor sofa

My first Ana White project. My friend Shelley and I are RN's, and she got me hooked on woodworking. I started with cushions from Lowes ( in the sizes that you recommended)to see if I loved the sectional for a few years. I loved it so much I decided to have custom Sunbrella fabric ones made. Even though the custom ones were more expensive, it has been worth it. They go perfect with my California Mission style home. Now I want to add the armless one and make it a U-shape. I did add a piece at the bottom back of each sofa to hold the cushions in. The seat cushions would slide out the back when sitting on the sofa. I made the coffee table to match. Our family loves it!