Thanks for the input, ya'll.
Lrdofdragons: I'll get some ballista instructions up in a day or so
Brag: The reason it has taken me so long to assemble the force to these specifications is I'm a bit of a design nut. If the army doesn't look cohesive (when I'm playing it) I get agitated. Haha. But i def recommend spikes in the shields. It does away with the nasty ring. For the record, I am not looking forward to a "space battle" with them; New Jersey/Eastern PA needs some medieval brik-warriors for sure...
Zahru: I find myself in a dilemma similar to Medivo...how do I create a plot device in which ancient civilizations can still be present in an intergalactic society without making them amish? I think majistiks as dimension-jumpers works for me
Generally: I want to add at least one more siege element to the army, some sort of cross between a catapult that has mantlet-like walls. In this way, the catapult would send casks of oil/pitch across the field and archers would stand behind the barriers with flaming arrows...anyone have any good ideas on how to attach archer-cover to a catapult?