I didn t have much time to get the project with more information (materials, for example). I attached basically images.
I did two options for you. I hope you like it!
The materials i thought to this project was basically steal frame to the extensions (or wood frame), and differents kinds of wood.
About the wall covering, I choose cement board (option 01) and the same wood covering in the option 02, but painted in white in some places.
If you pick my project, I ll send you the project more detailed, with materials and measurements, ok?
Thank you very much!