Thanks for looking through those. I've already downloaded a few mods, such as Amra's and Civ Gold to see what's available. What I aim to avoid is using the same base twice unless the two examples look completely different. Vlad, for example, looks too much like Justinian, who will be in the mod, but there's another version of Justinian as an African leader, who looks a lot different, so he might be in. Looking through the original Firaxis leaderheads, there's about 20 of them that can go straight in the mod, plus others, like Isabella and Elizabeth, who can be used somewhere - Elizabeth probably as Teuta (as in the aforementioned mods) and I might use Isabella in the Scheherazade guise as the Queen of Sheba (but with a different background) and still be able to use the Dido that was based on her, as it looks a lot different to Scheherazade.
I'll start looking at which civs are included initially at the weekend .
About Dido, I'll release soon a new version of her in toga that I did with the help of Refar.
For Teuta, I'm also working on something (but that won't be relased soon) that might work for her.