Mix of image sequence styles in the instructions

• From changes to the GitBuilding capability during development (Edit: this is not the reason, the question remains):
  In the instructions some sequences are presented as a set of separate images, using GitBuilding to display each image with the mouseover, for example on the basic optics page removing the Pi camera lens:
  
  In other places sequences are made into a single image, for example the basic optics page adding the mounting screw:
  

I favour using the mouseover for all sequences

• From style changes with different people writing the instructions: Some steps have images followed by instructions, some have instructions followed by images.

I favour images before the instructions