Hampton roads is probably going to be a bigger project than just fixing a cruiser shipyard. The sub didn't fire on the shipyard, it went after the port facilities we see part of in game that have probably gotten bigger, more complex, more automated, and probably more resource intensive than they were in TW3.
Complications to that analysis:
Progress requirements for a project aren't entirely/simply a measurement of the scale of a project. They're also a measure of the general complexity of getting it started, and the number of new, previously not understood things required for the project.
For instance, the Anadyr prototype isolinear chip facility cost 320 Progress, more than half as much as the entire Aberdeen foundry will for all three phases. This is despite Anadyr being a smaller-scale bespoke production facility that probably can't begin to approach Aberdeen's future overall output. Because at Aberdeen, the engineers know what they're going to be doing and how to make it work; at Anadyr, they did not.
Likewise, in the early quest the
Aggregate Plants project was 200 Progress. That was for a
global network, in all Blue Zones, of factories and quarries that extract and process many, many millions of tons of stone a year. Very large scale operations, but also fairly simple on a case-by-case level.
It's hard to say where on the spectrum the Hampton Roads shipyard would be, so I hesitate to try to predict the Progress cost.
Rebuilding the Johannesburg Macrospinner might be a decent opportunity to specialize it for Fast Twitch Myomer.
I'm not sure we'll replace Johannesburg at all. This sounds like exactly the kind of thing the Distributed Industrial Authority points to and says "See? SEE? This is why we take -1 Heavy Industry die per turn and invest into little factories all over the world, instead of one big megacomplex for all of GDI that can be taken out with one big bomb!"
It may make more economic sense to build three or four smaller myomer spinners, collectively below the limit of resolution of our game engine, that have the same combined output that the Joburg plant did. We might get a Light Industry project to build them collectively, or the new plants might wind up being private sector projects.
