OK, it's not so much a diorama as a display base, but I'd like some feedback and alternate approaches from you guys who do this a lot more than I do. This is my first attempt at painting the ubiquitous PSP, aka pierced steel planking, aka Marsden matting, in this case for a 1/72 Academy North Africa P-51.
The base is the Eduards 1/72 black plastic PSP one, cut down to fit a 6x6-inch case. I started with a base coat of Testors Light Earth (#1954) from a rattle can since this is North Africa, drybrushed a few areas and individual planks with Testors Steel (#1180), then dove in with the Rustall weathering system. Some areas got repeated treatments to try and get a varied look, but I was not really happy with the effect the black wash part of the process had, nor the dead flat final coat. Oil stains and spots are thinned Model Master black acrylic.
The photos show the finished base with and without flash, and with the almost-done model. It just doesn't look, I dunno, like lifelike rust?