I was thinking that they have had them for a good amount of time, so they could have made some blueprints then have several more "half-assed" vertibirds.
Vertibirds are pretty advanced machines designed for pretty skilled pilots, think of the maneouvers a pilot could do with those awesome tilt-wings. I couldn't imagine the NCR rebuilding them themselves... there's a reason after all that Van Buren was going to "remove" the Shi and their technology from the world
. Even F3 establishes them as prototypes, I'd think a Huey Chopper would be more appropriate.
Yeah Fish, cargo planes seem acceptable and pretty useful. Certainly for my Caribbean operations.