This could use a pass. Generally, but not always all construction only works one way it usually gives a benefit to other types of construction, but will only get a benefit from all construction. This doesn't work this way consistently. This alone needs proofing.
The above seems to be the only workable hub like the power plants in three as faras manufacturing with the rest the manufacturing buildings make poor hubs. Versus three what use to be the best planetary resources to get with being lucky to get, or build with a quite a few spaces around it is now useless you get adjancencies with the ability to build only one building you can use. Some of other hubs seem to be like this. wasn't the fusion power plant a 25 percent bonus in two, Anti matter 50 percent, and I guess quantum power plant +1 I guess. In the base game we got adjancency's, but we also got buildings that worked with them. Combining the two ideas we would have hubs that get more powerful with better technologies with being able to surround them with buildings where the adjancencies at least worked. I crusades we don't just have adjancencies that don't work, we also have weaker adjancencie bonuses, and not enough buildings to make this work.
On top of all this at least consistently have the hubs work. If giving us the hubs first caused this then I would rather have the buildings first. I like the idea of not just having power plants, but other building types to. I also miss other species having different types of hubs, and buildings.