I can't speak for Ross's process, though for me it starts with all the usual stuff for a paint job. Then it's grabbing reference images, figuring out which ones I like, and what I can fit in the space I have to work with. Sometimes a preliminary drawing at scale, so I can get a feel for what I can work in. Then grabbing the main paints I want to use, my fine brushes, and getting to work. Any profit should be in a much smaller font; realistically, painting minis is not that profitable for the time invested.
No, you are close (or right!) I would go something like:
prime black
base coat light grey and dark green areas (both scales and highlights)
wash
fill in light grey panels so the panel lines stand out
3-5 highlight layers for light grey and dark green panels that are highlights
draw scales in micron pen, 3-5 layers for each scale
paint gold scales here and there
chose reference work for the tattoos
draw tattoos in .5 or smaller mechanical pencil
paint tattoos with however many layers you need to make it work
shoot myself
paint cockpits
do bases
seal
And like Psycho said, make less than minimum wage after selling! It's just expected really, and I made the price to the guy I sold them too, so it's not his fault or anything like that. There's just a ceiling that you can charge to be honest.