More stunning progress on a theme to die for - and in N! Phew! Love the vignette under the bridge, and the coach even seems to have a Brighton registration? Is it a Bedford Duple? Slightly late in period, perhaps, as the chassis was built from 1939 - but you've already scratchbuilt trains, so allowing a year or two on the road vehicles is hardly a compromise worth carping about. I can't help feeling the 1930s gutter detritus would be different from the 1970s - certainly no drinks cans, and bottles were glass, but you got money back on them, so who was gonna leave them in the gutter? N gauge newspapers would be a bit of a challenge to most of us, too.
I remain dazzled by the challenge you have set yourself, and most impressed by your responses in the model itself!