Whilst there is not a formal CAD drawing or CAD model yet as far as I know, you can get an internal view of the camera on this site:
And here's charts of the mechanical dimensions.
Thanks! I already tried but unfortunately, the images aren't correct so the measure doesn't correspond to the technical table.
A mechanical drawing for the D435 is on the very final page of its data sheet. Apologies for not noticing that before.