I explain how I have converted the bed part of a Renault Grand Scenic van into a camper van, with a pretty good result. I used pine wood boards, which are not the lightest but are economical, since as with everything, in the end, economy rules. In principle, by varying the measurements, it could be suitable for another van. If you have any questions, you can ask me in the comments. Regards. 🚐🚫💰💶