Paul has posted a photo tutorial on his methods for scratch building a Roman Town.
Watchtower Paper Models
If making a watchtower from scratch is a little above your modeling skills, you might be interested in these very nice paper model watchtowers.
Making A Roman Watchtower
Making Sub Roman Houses
Here’s a post on making “sub roman” houses — the style of dwelling, however, probably covers five hundred or more years.
Kings of War Variant: Romes’ Rise and Fall
Kings of War is a great fantasy rules set from Mantic Games. Here’s a variant for Rome’s Rise and Fall.