Oh good, I am not alone in eyeing every new model as a carve up! The alternative body whether resin cast or 3D printed to fit the chassis, as suggested by 'its-er' sounds like a winner to me. Bound to be someone in the P4/EM department wanting to build their own chassis, who will relieve you of the E4 body.
If somebody wants to do an alternative body for the E4 chassis, then the E4X rebuilds would be a good bet. The various X rebuilds of the Brighton radial tanks are quite attractive in a freakish kind of way with their oversized boilers.