Wouldn't it be easier that the whole part which holds the seats would be modular. So you get in your seat and the whole seat part with 300 or so seats is pushed

Wouldn't it be easier that the whole part which holds the seats would be modular. So you get in your seat and the whole seat part with 300 or so seats is pushed into the plane on a rail. Fastened with whatever at X points and the plane is ready to go. So in a case of accident it can be jettisoned from the main fuselage, and it would land with a parachute without anyone getting injured.