Middle seats back up and front platform packed. We'll use the space inside the flatform (it's framed with 1x4s, so there's a bit of space in there). The platform is rigid, so I'm contemplating adding a set of longer folding legs and letting it double as a pull out table. The folded platform section can be stowed on top of either the front or back half of the rear plaform, so you can access either of the folding sections.
One last shot to show that having the plaform in the van has no affect on the functionality of the center row of seats.