I made the Roanoke after watching some episodes from the 10th season of SG-1. She started out as my attempt to model what a Ship with a hybrid of Tau'ri and Ancient technologies would look like, but She kinda turned into something else.
The big guns are rail-guns, and the little ones are pairs of Tractor/Pressor emitters.
This is a WiP pic. Made and rendered in Google SU.