Interesting bit about the WCER coach. We do that coach in 7mm. They were an off the shelf design sold by Wright and Son (Metro Cammell) from 1865 to 1880. These coaches were bought by a number of companies. These include LSWR, LBSCR, Furness, Cambrian, LNWR, Manchester and Midford, North British and WCER.
Marc