Would it be more cost effective to build modules, QA them in a factory, then bring on site and put together on a slab or leveling piers in 2/3 days; or start with pounded dirt, concrete, and 2 x 4 and 2 x 6 framing and finish in 2/3 months after several months.
My late FiL was a major proponent of quality manufactured or modular home; especially for average, affordable functional houses; unless one was going for unique architecture or historic recreation, he considered most home construction similar to having mechanics and body specialists come to your driveway and build your mini-van or truck from scratch.
Manufactured housing in California now has to include renewable and eco-friendly functionality, including solar panels and options for battery walls, as well as being up to code for earthquakes and other health and safety requirements. It's at least half the cost of the equivalent building on site, and can be manufactured, inspected, and ready to put on site in half the time.l
Haele