Chosen concept

I have drawn some sketches where I need to develop for this design.

Firstly 2 seating areas need to be changed.

seating (1) is too high up so users cant reach it so need to lower the seat for comfort.

seating (2) is that slope going to be comfortable for the users??

how long does it seat needs to be??

Also the height. How high do I have to make this.

Also I need to consider the material.

--> maybe wood will be a good idea for the design because it will go well with the site. NATURE.

So I need to consider these factors when I'm developing.