HANDCRAFTED SOFA / BENCH is actually very stylish and something almost anyone with basic skills and tools could do. Buying cushions would be end harder part and the expensive part. Unless you know how to source foam and make cushion covers.
Make furniture-quality cuts with a circular saw with these inexpensive DIY saw guides. Make both from medium-density fiberboard in just a few hours, then use them for years. Learn about the two essential saw cutting guides.