Nice looking display there, always good to see what others have done and give ideas for our own.
You guys down under and Rob across the pond really need to try out getting some 3D prints done for your displays.
This designer sculptor has some great looking files for sale, you just need to find someone who can do prints, such as Paul Bell though sending stuff abroad can be more than the item costs, but plenty of Forum members have used him, such as Mike Miller for his impressive Japanese Place.
If you do decide to give 3D a try tell them what scale and if you what just a facade of a building for a shelf display, how much of a building you want etc and away you go !
Something like this Lion Gate would be great for Alexander storming Persepolis.
https://cdn2.myminifactory.com/buttets/object-buttets/60d149a01d916/images/720X720-mmf-enki-arches1.jpg
https://cdn2.myminifactory.com/buttets/object-buttets/62ba6e1bcab6c/images/720X720-release-scenery-walls-1.jpg
Or a section or two of this would look great too in some Greek or Roman scene,
https://cdn2.myminifactory.com/buttets/object-buttets/63d308b17a741/images/720X720-release-symposium-1.jpg
The designer of these has many other ancients themed items worth looking at :
https://www.myminifactory.com/search/?query=gadgetworks
Of course you still need to have someone print the designs for you.