It is not for a diorama. I build my models on hard cardboard so I can detail them at the work table, then I glue them to the module. The light gray is Age-It Easy by Micro-Mark. The brown detail over the light gray is dark brown
leather dve mixed with alcohol. The very dark gray is my on mix of India Ink and alcohol. For the rust look, I like to use Model Tech Studios Rusting Solution.
After the inside was finished,I scraped some light yellow chalk over all the junk, then used a soft brush to spread around.
Thank you for the compliments.
BIll