Modern Outdoor Sofa (DIY)

For this project I built a DIY modern outdoor sofa.

The dimensions of the DIY outdoor sofa are:
width 200cm, height 60cm, height of seat 31cm, depth 67cm.
Dimensions of the wooden beams: 7x7x200cm.
The wooden boards: 10x200cm.
I think I bought 7 or 8 wooden beams.

I have used 8x100cm stainless steel screws with plate head and torx. You can use hexagon head screws also.