Brilliant, helpful and diverse posts boys, thanks.
A special thanks to Joe for taking the time to post the superb bunker link....Bit late for this dio., but I've saved it to my favourites...Thanks again Joe.
O.k., here is the latest progress...as it's throwing it down here, I've been in the shed throwing PVA around.
I've added some life to the remaining plywood by covering it with some sweepings from the drive.
Here's how....
It's very simple and effective.
Soak the chosen area with watered down PVA. Get your sweepings, whatever, in a dust pan. Then sprinkle the contents over the PVA and leave for a few minutes. Turn the dio. over and gently tap the base. Some of the stuff will stay on and some won't.
Let this dry and take a look and if required, repeat the process......When doing this kind of thing, don't be fussy...A:- where the PVA goes. And B:- where you throw the sweepings, just go for it. If you fiddle fart around the effect will be lost!
See in the last picture how through not fiddling with the PVA, the sweepings have gathered in corners and crept up the walls a bit. I think this looks more natural than just a flat surface, particularily for this diorama.
Using the same method, I sprinkled some dry tile adhesive around the building to get a sort of concrete lumps and dust effect. Finally, I've replaced the rubble etc around the main building.
Here are the stage pictures so far...Still plenty to do, but as usually happens with me, I start off with precious little idea of what I'm going to do and now they are piling in!
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Starting to take shape now, and thanks again for your excellent input so far. I appreciate them all.
Cheers,
Ron