[ecomodded]

If you split enough hairs it adds up to a large effect, once they are piggybacked onto each other. The rooftop tip is a big"hair" ripe for the splitting.
Having a 2nd hinge near the tip, you could lock it open then fold it inward for storage.
If you used the fiberglass rods or wood / old hockey sticks to form a frame you could then secure canvas over it and tighten it like a draw string to the bottom.
I like the collapsible function, I assume you made it that way to elevate parking issues.
I would love to see a boat tailed vw van, i expect others feel the same way.