To mask the PCB part visible through the windows of the cab, I made a semblance of interior fitting out.
I started from the following sketch, made from photos. Do not look for accuracy or scale. It's only a sketch.
I then adapted it, knowing that the PCB position did not make it possible to represent the details below its level, that is to say… almost everything: seats, manipulators, brake valve, etc.
So that's what's left of it:
The backsplash, made of different thickness polystyrene, has to be milled (in addition to the cutout of the base) to let a place for the inductors. The base (0.5 mm thick plastic card) is painted in matt black, the desk in light brown. Dials are represented with a silver pen. The assembly is stuck to the PCB with Patafix.
There are light leaks everywhere: the lights are visible in the cabin, and they light up the track under the loco.
For the first case, I filled the space between the PCB and the body with Patafix. For the second, I stuck, still with Patafix, small plastic card squares in the chassis corners, where the light guides pass. To access these places, simply disassemble the bogie housing and remove the extreme axle.
Finally, I put some black paint on the light guides just under the “parabolas”, and into their housings in the chassis.
As I had broken a drawbar dovetail, I was very much ennoyed, for I found no spare part in the Roco catalog, when I discovered by chance that the Fleischmann draw bars ref. 6575 fit perfectly, provided that a small simple operation was practiced: trim the internal relief of the closing part of the casing. Good to know, right?