This is my attempt at the 2x4 outdoor sofa. The entire sofa is made out of 2x4 Redwood, so the cost was a little high at $150 for the wood. I'm still waiting on cushions, but I went overboard and bought them custom made so the total for those came out to $520. Overall, I could have easily bought a complete set online but hey, this is more fun!
My one concern is the back support. I'm thinking of building something angled in, but haven't thought of the best approach yet, that will still look good.