This has been an excellent tutorial series by Kent, and I have learnt many new techniques, which I shall try an incorporate in my own projects. Particularly using the texture atlas add-on.
Having spent many hours following both the modelling and texturing parts, my space/sewer helmet is now complete (I appreciate more hours could be spent on many modelling and texturing refinements).
Maybe a follow up would be to show how to set up the scene to present the helmet animation as Kent has done in the preview of the texturing series?
I submit two images one forward facing and a second from the rear.