Installing a third seat is it possible?

We took out the jack knife sofa behind the passenger seat and installed a 3rd captains chair there with a bolted down table. The front seat will swivel around so the two can face each other across the table (when not in motion). The seat is fastened to the floor, through to the sub-floor, and cross members into the frame outriggers. The seat-belt is attached to the chair, and to the wall with a plate fastened to two vertical members in the wall. I know you would prefer the child between you, but this would make a more traditional "backseat" positioning.

This set up was for 3 adults to travel for an extended time.