Looks excellent, sir. About the same shape as some cars I've owned.
The yellow line from the left-side axlebox. Is that an intentional addition, or a long wayward strand of grass?
I forget the timeframe you placed the CVMR in. Will the DCC conversion be used to 'update' the layout to a later period? Will you revisit the scenery to match?
All of this is why I've ordered mine in LMS black. Should work fine with the gaggle of PO coal wagons I've gathered up in Chicagoland to go behind my Garratt.
All of that is well and good, and about what happened in the UK eventually. I simply don't think the concept existed in 1955. Design and traffic offices were still in the steam mindset.
I think there was also a hesitation to go all-in with one make, in the face of generally failing industry.
Capacity may have also been an issue. I doubt EE could have kept up the gap if Brush and the like had been ignored.
That's still immensely poor for analogue locomotives. The 'long 0' strategy still will require an occasional opposing signal, which can burn out motors. I think the more modern motors are actually more susceptible.
I'd imagine smaller classes didn't quite need the clearance. I'd also think the BR Pacifics, which started at class 6, might have higher boiler pressures, which would be more volume being ejected more forcefully from the safety valves.
You could go with plain sky, with some scenery on the layout built ultra-low relief to semi-incorporate the attached backscene.
These are Freemo-type modules, though, are they not? Is there truly a front and rear of the modules?