Masterclass Models (Chris Higgs) has prepared a test etch for both chassis and body. Further progress on hold, pending resolution of various items.
N-Brass Locomotives had a body kit for Dean goods under development for several years. It was finally released about 2013, as a set of scratch build aids in etched brass (provide your own brass tube for the boiler, etc), with most of the required add-ons available separately from N-Brass.