I like version 1 best. Without the piping.
Maybe make the hollow ends 2 inches deep and have the cushins pivot on piano hinges to expose hidden storage areas.
A freind has a similar but more modernized deisgn. the whole base is a cushion, and a few inches above that
where the cushions are on yours, are tables, that slide apart or together.
Apart for foot resting, together for pizza box holding.