Whenever you here a liberal say that we need to do something for schools, it just code words meaning “Hey Teacher’s Unions, I got your back”.
Not just the teachers, but the pipefitters, plumbers, electricians, masons, welders, carpenters, steelworkers etc. etc, that are required for the construction of school houses.
Most, if not all mobile and modular builders would be non-union, if I'm not mistaken.