Agree 100% about HC being a great ‘toolkit’ for designing scenario-based forces. Shortly after the publication of the main rulebook, several of us on the WG forum advised against publishing army list books, but apparently we were swimming against the tide of popular demand. In any case, the Republican Roman army list does also provide the option of fielding legionaries in standard-size units, for those who so desire.
"Ventosa viri restabit." ~ Harry Field