That yellow plastic end is just so awful! Surely a re-paint is needed.
The buffers are also terrible, cheap and nasty looking, too small and set too low (as on the mk2 Bachmann model). Replacements can be used though, mounted a little higher with something behind them, other than the fresh air on the supplied model !
As far as I can see, no 4mm RTR model 37 has captured the look of the actual 12"/ft prototypes windscreen, but this ViTrains model comes fairly close.
The general problem seems to be the 3 individual windows, where the thickness of the glazing material is difficult to hide. This also makes the windows look too small.
The windscreen pillars are always much too thick, whereas the prototype is virtually flush right across.
I would have thought a better solution would be to use a single piece of glazing for all three panes (moulded accordingly) with a either a very thin etched frame over the top, or high quality printed window frames and surrounds?
Look at pictures of the prototype to see what I mean.
Here are a couple of links.
Another class 37
and another !