The APX ( also known as the `` Aluminum Performance Crossover '' ) is an aluminum concept vehicle revealed at the 2006 Geneva Motor Show . It is built on Lotus Engineering 's Versatile Vehicle Architecture ( VVA ) . The APX ( also known as the `` Aluminium Performance Crossover '' ) is an aluminium concept vehicle revealed at the 2006 Geneva Motor Show built on Lotus Engineering 's Versatile Vehicle Architecture ( VVA ) .