As planned, I ordered a tiny sound decoder trying to make everything fit in there. I chose ESU 58820 LokSound 5 Micro DCC Decoder:
Unfortunately, I didn't take any pictures of how all of this fits in the engine, but it did! And I loaded a ESU sound project. A video soon ...
I then moved on to adding the details. Back with my BB 16500 Vitrains, I struggled quite a bit to add details and found that my pliers of low quality were not doing the job. I upgraded with Japan-made tooling ...
A couple of days later, I finished installing the details:
This machine is now complete!