I still see two big issues with the Fit.
1. The rear entrance "barely" handles a folded over WPC. I measured one creating a shape of 29.5" by 26" and that's about the biggest rectangle you can get through the rear shape (which is not a rectangle, it has curved edges).
2. How do you handle the 8" drop from the bumper to the rear cargo area. That looks like a deal breaker for me.
I can imagine raising the floor -- building a 2' x 3' wooden floor with a hinge that unfolds, and then inflating an air mattress underneath it to fill in that gap. Idea being -- so that you are roaming-ready.
Seems like a pretty non-pinball friendly vehicle.
-mof