The biggest killer are all the specific changes each city decides they need.
If a standard feature set could be achieved mass production would be easier to arrange.
Perhaps with a module system to remove or add some subset of feature that are easily to adapt to it.
The 80% of federal funding¹ should be based on a "universal common standard", and cities pay 20% plus the city pays 100% for various customisations they need.
¹ I have not made any effort to verify this data but it's in hte article. It seems more generous than the federal government tend to be.
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