It will have to be disclosed that it's a modular home ("pre-fab" just doesn't have the same cachet as a custom built home). People still think that it's inferior in construction quality. And as such, you may not get the same re-sale value as you would a custom built home.
It's a shame, really, since there are so many benefits to this, and the hybrid type of building.
See this article Prefab is not the answer to Affordable, Modern and Green Home
We got a number of around $125/sq ft for a 2000 sq ft home but quickly realized the standard options that covers are much less that what we would want. We are waiting on pricing for all the upgrades and waiting for some addresses from our local builder so that we can drive by and see a few homes in process.
If you did go through with it would love to hear about your experience.
When working as a buyer's agent, I always consider resale for my buyers. No one plans to sell in 6 months or a year. We usually plan to stay in a house a minimum of 5 years and usually more. But, there are times when the unforseen makes moving sooner necessary. There are more buyers for houses closer to cities. That is proven by the fact that there are already more houses close to cities.
Hope this helps.