Those designs are by Gijsbert-Paul Berk.
They were made in 1948 at IVA Driebergen Shool.
A Volkswagen-engined highway cruiser for 2/3 people.
You've got it.
Gijs Berk did it for the IVA in-house magazine in 1948, where I believe it was described as an Autobahn Cruiser. Quite innovative for 67 years ago!
Another point to add. Well done!