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 arra

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.