My parents were general contractors putting up modulars in New York while I was growing up.
I highly recommend going this route, especially if you plan on managing the project. The only downside to a modular is they are somewhat limiting in terms of floor plan.
Consider setting the house using rollers. It tends to be cheaper since there is no crane on-site and it usually means there's no drywall cracking. There are some limiting factors here, such as the number of floors (ONE!) and you need access to the foundation, practically at grade.