Unfortunately I don't know the exact model and manufacturer of the rooftop, but customer sent me some pics of the part in place. Caravan is a Hymer from 2008.
It holds a framed mosquito net on four sides with a clip mechanism. Customers broke after a few years.
Use a material that is springy enough for the clip to work (a PETG prototype worked as well as the final part in Nylon.)
The author hasn't provided the model origin yet.