Maybe, but when one considers a certain retailer is selling a 4 CEP for only 30 quid more than a replica chassis this gives you the oppertunity to have a "broken down" 4Cep, or two 4CEPs running together, or the Lymington branch etc.
On the Cardan arrangement, how about the motor from the Bachmann 150, cut down as I've seen somewhere else on this site with seating fitted around. Maybe better for the blue 4Vep's with the curtains and a restricted cabin view.