What ships can Marine Frigates capture in Homeworld 2?
Solution 1:
In the HW2:RM (and original HW2) campaign, you can't capture enemy production units (carriers, facilities, motherships etc). Destroyers and hyperspace gates and I think resourcing units too are all fair game though. Also I don't think you can capture corvettes or smaller but I'm not 100% sure on that.
Finally, unlike HW1/HW1:RM, you can't capture units above your unit cap.