The problem THE PUTOUT SEAT and COFFEE TABLE SET solves

My project THE PUTOUT SEAT solves the problem under the track, DESIGN FOR SMART FURNITURE

1. having extra seats / storing seats in an indian household.
2. carrying / transporting seats t different locations , for example, one can take it to a beach, a garden, to ones farmhouse etc.

Challenges I ran into

1. making the seat for all shape / size of people.
2. making the backrest open and rest at an comfortable angle, so than one can sit freely and comfortably.
3. making the legs open at 90 degree max. and not to let them close when one seats on it.