It was really interesting. In the end I had to use a double tagging (e621 and Danborou) for a greater understanding of objects. Without it object are either anthro or used in various holes. Pony is definitively not designed for steampunk0
And I feel a little trapped as I finally had to manually tag nearly all the dataset :)
For the tesla machine, the prompt is "tesla coil, scientific instrument, inanimate object". Other concepts are intuitive.
Model is published on https://civitai.com/models/475283?modelVersionId=528663