OK, here is a pic of the front of the prototype, showing I got the vacuum pipe bracket on the first post somewhere near right.
The steam heat pipe was a later addition.
Now to the driver's side under cab pipework.
This is rarely modelled as far as I know but it is very noticeable, even if not as prominent as the massive bundle of injector pipework on the fireman's side. There is more still, but it is fine enough not to worry for my purposes.
0.7mm copper wire bent to shape, Brassmasters pipe flange soldered in the correct position, secured using a twist of 0.2mm wire soldered in place on the bend and superglued into a tiny drilled hole. End of the wire glued into a drilled hole in the rear of the loco. A second pipe, soldered onto the first, joins to a water hose from the tender. There is a similar hose from the rhs water injector, and both of these fit nicely into the void under the tender, between the steps. The tender can then move freely without contacting these pipes when in normal use.
As I mentioned, these are actually attached to the tender on the real thing. Most models have them, if at all, on the cab.
Start point was a set of Brassmasters cab doors. Cut off the mounting strips so that they are 2.5mm long.
Solder short lengths of 0.45 ns wire to the rear of the strips
Drill locating holes (these on another tender)
Paint and fix in place:
There is a small diagonal chamfer at the base of the cab door closest to the tender, presumably to accommodate the slope of the fall plate. I've not decided whether I'm going that far yet!
It does work. You could mount them with a little more play, but the slight springiness in the loco-tender coupling gives a tiny bit of play. They're rigid enough but flexible enough. If that makes any sense.