Wade:
Are you talking about CNC equipment for a vessel that has the plate already rolled, or are you looking for equipment to cut the plate in the flat, like a roll out?
We used a CNC plasma cutting under water to cut nozzle locations in the flat. Equipment was a mixture of controls, linkages, welding heads, etc... from various manufacturers. The software we used was Sigmanest.
Let us no more of what your looking for and may be able to offer more.
Scott