I’m working on a UK locomotive. I got some plans from a friend in the UK for the type of coach it would pull. Been working on them. Making two.
Basic wood formers underneath, clear plastic over it on the sides. Slice of 4" pvc pipe for the roof, embossed metal to go over that. THe plastic sides had black vinyl put behind where the windows would be. I layered Nashua metal duct tape over the outside, after I embossed it with the window/door patterns.
ONce painted, I cut out the window shapes and slowly peeled off the foil to expose the window areas. David Leech made the bogies(trucks) for me, excellent work!