It covers many of the pitfalls he encountered during the design process, and features an astounding number of well cropped reference images from a variety of sources. Perfect if you're doing any Terminator-related art.
Particularly helpful is his recounting of the use of Alclad-II chrome lacquer paint:
After the gloss black base coat was fully dry (I gave it 24 hours), next up was the Alclad II chrome lacquer coat. I set the air compressor to approximately 15-20PSI and held the airbrush at around 10-15cm from the parts being sprayed. Application was the same as with the gloss black base coat; using a steady 'brushing' motion over the surface until I achieved the desired reflective finish.
[...] Alclad II chrome is a lacquer comprising of small metal particles. I found that it dries almost immediately upon application. I recommend a 'less is more' approach when applying Alclad II chrome - if you spray on too much it actually starts to dull. There is a 'sweet spot' to find when airbrushing the lacquer - immediately stop as soon as you achieve a nice reflective metal finish. NOTE: Alclad seems to brighten up even further after you have finished application - it actually happens before your eyes over the course of a few seconds. I believe this is caused by the metal particles in the lacquer slowly settling. Additionally, once fully dry (it doesn't take long at all) the chrome finish can be (gently) buffed up with a soft cloth (eg a glasses cloth) which wipes off the fine dust that tends to appear on the surface. You end up with a very reflective, metal-looking coating.
Start the process by reading his initial post here.
For a more resculpting-heavy design process, see SiO's Terminator Vinyl Endoskull build here.