With most of the main components in place (except for the Humvee) its time to work over the details. Basically I study my reference photos and pick up all the smaller items that make up the scene. Things like...
A tool box and an oily rag
The off cut scraps under the cutting stand and the black soot from the plasma cutter
The shiny edges of fresh cut steel before it has a chance to rust
and the filings that stain the ground where angle has been repeatedly cut with a hacksaw.