Sorry to correct you. The Peugeot engine needed more space than the Chenard & Walcker unit. So you can easily identify the Peugeot engined vans by their protruding engine cover like those on the later Peugeot D3. Consequently the puzzle car must have been propelled by the Chenard & Walcker engine. On the other hand, all Type CFP ("fourgon boutique") were Peugeot-engined. Even Antoine Demetz, author of a very detailed Charge Utile article about these vans, is not sure whether this is a CFP prototype by Chenard & Walcker itself or a Type CHV modified by an unknown coachbuilder.