I have quickly rebased a few figures on 60 by 30mm bases.
First up a Warband (3WB)

And secondly a base of Slingers.

I am thinking doing Ancient Britons vs Caledonians. I found 3 unpainted Foundry 2 horse chariots, a bunch of Infantry and some cavalry as well as over 60 painted infantry and 8 cavalry. I should be able to build these armies without having to buy anything extra.