It's my understanding that the previous versions aren't compatible with SH5, especially the way the interiors are made. They also don't include anything but the control rooms and conning towers. I would think that everything would have to be built from scratch.
That said, I will be glad to be proven wrong. If it turns out to be easy to develop other boats you won't hear any complaints from me.
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“Never do anything you can't take back.”
—Rocky Russo
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