Thanks for the comments
@ Marcin - Wires are not particularly to my taste. When possible, I swap them for rolled paper, as it can be painted and glued with the same pens and glue. The suspension and brake assemblies were made without wire. Anyway, sometimes a wire is useful, like the one on top of the sandbox shown in the second picture.
@ Erik – right. Those details, according to the instructions, don’t require plumbing but there are other instruments inside the cabin and many “wires”, both inside and outside. I’ll get there
