For some reason, this motor in the back of this Garratt locomotive, doesn't fit. I'm sure it fitted when I carried out the test build. Maybe the supplied power unit is longer than before ? Checking the photos of the build, I think the configuration is the same one I used last time.
Anyway, the motor has to poke into the coal space. Not a lot but enough to require a hole in the metal. This was easily cut by drilling the corners of the hole and then "joining the dots" with a piercing saw.
A simple black plasticard box will cover everything up and then a pile of coal with hide this. Anyone looking at the model will never know.
Update: Problem solved. The motors are longer than before. Problems with Tenshodo supply apparently.