Wooden bench with backrest

In this video I demonstrate the process of making a large bench with a backrest for my terrace. 9 months ago I bought 3 large pine boards 6 m long each. These were damp, so I left them to dry on my balcony for a while. I used one board to make the bench. In order to prevent the movement of wood, I cut this board lengthwise and re-fastened with decorative walnut inserts. I tried not to use any metal fasteners and was successful. The bench turned out strong and stable, the angle of the backrest turned out to be comfortable. I think this bench will serve well for a long time.
Thank you all for watching, I hope my methods and ideas will be useful to someone!