Doing a bit of catching up on threads....
I like the layout Alan, plenty going on.
I don't usually like posting comments / suggestions - just in case, but as you asked for them regarding the rubble in your opening post, I feel you won't mind, and the following advise is given in an honest way which I hope will be of some help......
The rubble looks a bit like lumps of concrete, sort of ready mixed look. I think it needs to look more bitty and rubble like. As Barry writes, break up some bits and bobs from around the garden. Get some scrap bits of wood and cut into various lengths and thicknesses. Plenty of dust too. Try and imagine the building when it was intact and then get in your mind's eye just where the debris would fall....Don't be frightened of adding too much muck. I like the stuff knee deep!
The trouble with looking at pictures of damaged buildings and the associated rubble is you try and copy the image, thus loosing the free flow, so by all means use pictures as a reference, but do your own thing and just fling whatever on the base, otherwise it'll look stunted and won't look right.
See your tank? It sorts of sits there, dead flat on the base and the rubble looks like it's been swept away from it, all neat like. There is nothing underneath. If you can, remove the tank, spray a bit of diluted pva on the road and sling a handful of bits where the tank was. Then re-spray the rubble. Press the tank into this mixture and give the model a wiggle. This will bed the tank in, rather than on the debris - and try and give the tank an angle, be it tilted or up and down, side to side....or both! This will bring more life into the tank's position.
The above is in no way a criticism of a great go at the rubble, just a couple of pointers to help with your next build. Just remember a diorama such as yours needs tons of rubble, literally!
Pile it up high and proud....
I hope the above is of some use and is written with the very best intentions.
Ron