Klaas, as you might know, Ian and I are part of the Sketchfab masters group. We discussed the topic about the viewer api there to and we thought it was nice to have a dedicated tread for it. Since you aren't part of the Sketchfab masters group, I think it is best to keep the tread on the most appropriate place, namely the Development and API section.
I offered to write the texts so a layman can understand it (and I know exactly what you are doing ), similar to my tutorial about the annotations app I made earlier (of which I now know that I am going to change the code drastically) and prepare the models for the examples.
For now I am preparing my rat skeleton so it can be used in the viewer api, but I am also working on more elaborate models similar to that with which I want to show and hide stuff and use for animation once that is incorporated into the viewer api.
Agreed that this tread belongs here?
If not, @bartv can you move it?