Buying a sofa is the natural way when you need a large and comfortable piece of furniture in your living room. But how about building a sofa? Yes, it's a new idea, but it's gaining momentum as DIY makers churn out creative new sofa designs that are simple and fun to build. These DIY sofas use materials from your local home center, and you don't have to be a veteran carpenter or upholsterer to assemble them. 1. DIY Two-Piece Upholstered Sectional Couch. The motivation behind this DIY sofa was...