I knew I'd seen the idea somewhere before! I'm sure it was your pictures Lynx!
You did a great job with your sets, I dig your approach and they look very playable, with all figures being the same size. The poker chip idea for height is great.
My favourite though has to be your Gaul queen, two-fisting a pair of swords. That's got to be Boadicea!
I had a thought to use ballistae for my Roman rooks but they are too unstable! How irritating.