A number of people have very kindly ordered some of my recently released 3D Printed GNR 6 wheelers: http://www.rmweb.co.uk/community/index.php?/topic/111744-mike-trices-shapeways-shop-gnr-6-wheel-carriages-now-available/page-3&do=findComment&comment=3059646. They are body only kits and require various bits and pieces to complete, including providing a suitable 6 wheel chassis. Some time back I wrote a topic covering 6 wheel chassis: http://www.rmweb.co.uk/community/index.php?/topic/11223