That is no chair! Are you trying to make a chair that is using the same structure as this table?

There are multiple ways of making that depends up on dimensions and thickness of the door you can join the ply or block board using joint pins and use door stiffener which you get in any hardware brand you can make a frame with aluminium pipe and use MDF or less thickness material and sandwich the frame Outsource to professional door making people but make sure the inner laminate is used more than 0.9mm which majorly sometimes responsible for the bend

If there is any way you could close the kitchen window in case you have another source of light for the kitchen, it would be good. If not, you could consider a folding panel for a uniform look from the outside. Also, add good lighting since the entrance seems to be away from natural light source. The outdoor AC unit as seen on the long wall could be flushed seamlessly with a wooden panel on top which could also have a light source focusing on the wall, thus taking care of your services as well as lighting up the entrance.

I want to design some good face of side view wall