The plumbing isn’t completely done, but it’s taken significant shape that I’m moving on to making something else meanwhile: the cab.
The cab is most likely constructed in red oak in frames and panels. The pieces fit together in tongue-and-groove fashion. I’ve recreated the fitting details and modeled each frame and panel separately.
Here’s a detail of the upper left corner:
Here’s the cab’s frame set on the engine temporarily to check the proportions:
Speaking of proportions, the Holliday’s cab is actually out of proportion to the engine’s 5/8 scale. The cab needs to be large to hold the crew, and subsequently it appears much bigger than the cabs you’d see on other 4-4-0s.
Here’s the cab frame in ash oak:
And here’s the frame with the panels fitted in: