Here's the finished products.
I did the black gesso and black spray painted ones the same with orange and blue accents. Honestly I'm not sure which is which. The only difference is that I went a bit to heavy on one with the ivory.
They were painted with
-Black undercoat/prime
-Orange heavy wet/drybrush
-Blue detail
-Dark Rusty Brown wash
-Light Tan Drybrush
-Very light Ivory Drybrush
The formerly green-washed container got a spray with Rustoleum Satin "Lagoon". It's a lovely industrial blue looking color. Where it hit bare/washed wood it went on perfectly flat. Where it hit glue (I used PVA) it came out satin, though the drybrush knocked it back to flat looking.
After the spray and stripe, it was washed with Rusty Brown and drybrushed with Light tan
The red container was base sprayed red/rust/ruddy brown" (depending on brand) primer.
After the spray and contrasting stripe, it only got the light tan drybrush.
There you have it, four different ways to paint your containers. I was particularly impressed with the Lagoon blue color. I've avoided "satin" spray paints in the past preferring flat primer and camo colors, but there are so many great shades from Rustoleum I may have to experiment with a few others in the future.
In the end, regardless of the color chosen, the panel lines stayed nice and dark and easy to see. I'm very happy with the way these turned out. They look great and have a price-to-sturdyness factor that is simply unmatched by any of the other model cans I've seen and I've just about seen them all. I've been quite skeptical of MDF terrain in the past, but these have got me warming up a bit to using it for certain applications.