3d of bench in lobby and some sketches

I have already spoken to my father about the bench to see what he recommends and find out if he can price materials for us at cost.  He can and will get us materials at cost.  I'm envisioning something high backed bench with attached cushions.  Since the box is hollow today, there may need to be some additional construction.  Springs can be used again, but I understand that they are more expensive to replace than foam.  It may be better in the long run to rebuild that box with a foundation for foam.