This one has been identified conclusively over at Autopuzzles for quite a while now. Should be a 1961 Wendt Wagen
http://www.imcdb.org/vehicle.php?id=373228

And unless anyone disagrees I think this can be called solved
http://www.imcdb.org/vehicle.php?id=239712

This one I only just identified but it can't hurt mentioning it here too
http://www.imcdb.org/vehicle.php?id=182875