another update.
I applied a basecoat of acrylic paint mixed with pva to fix the gravel more firmly to the boards. The I added some little scenery pieces mainly resin cast by myself. open boxes , c ration boxes, containers for warm food ( is there a name for these things?) and a 50 cal for the entrance of the firebase. The cans of the c rations were done with evergreen dowel. The smoke grenades are 3d printed.