Looking good

How about changing the Briton Diplomat map model to that of a Druid as they were often used in advisory roles rather than on the battlefield itself ?

Rather than having a sperate 'fanatic' unit is it possible to just have the front rank of a unit 'naked' ? The bravest and most battle hungry Celts would be at the forefront of the ranks screaming challenges and generally looking threatening.

The following is kind off topic but I like his style

'Raiding Celtic tribes under the leadership of Brennus ravage Rome and occupy the city for three months. Offended by the dirty conditions of the city (they were country boys at heart) they demand a ransom to leave the Romans alone. Brennus demands his weight in gold and when the Romans complain he throws his sword on the scales to be weighed as well with the cry "VAE VICTUS" - (Woe to the Vanquished).'