Side curtains hang on bungee cords strung between hand holds. Front curtain is on a spring rod that fits into holes already in the minivan. I just removed the oval covers and found readymade curtain rod holders. Rear curtains are attached to sticky velcro (that doesn't stick all that well!).
minivan seats as camping chair - Google Search More
Camper van concept | Available for rent in PDX from vagabondvans.com