@asterion2005: You may consider to add even the Roma Surrectum 2 vegetation, it's awesome!
About shields, there are the famous shields by leif_erikson, you'll find them here on TWC:
http://www.twcenter.net/forums/showt...tatum-Shields&
The shields belonging to the Notitia are too later for the time frame of your mod, anyway they could be of some inspiration, we don't know ANYTHING about the paintings on Roman shields during the III century (who says the contrary is a liar), apart the wonderful exemplars found at Dura Europos, of course.