Not sue if they only build for themselves (buy the land, build the house and put it on the market) or if they’ll also build for a client who already has the lot, but you could ask.You could also look into modular homes (built in a factory and delivered/assembled on site).

So I recently assembled what many consider the best land in southern Colorado located in the Pueblo Colorado area.

Have been investing for almost 2 decades now and have assembled a nice portfolio of SFR properties. 

Considering the complexity of the structures themselves plus the added complexities of transport/assembly at remote locations, I thought the costs were extremely reasonable.

I started out about 18 years ago assembling large commercial projects for developers so know the process.I can't help further as my schedule is jam packed with clients buying existing NNN commercial with tenants and leases in place and then I am buying the value adds myself to reposition.You might could bring on a fee for developer, consultant, or larger developer as a partner.

Anyone know of a warehouse that carries prefab countertops and kitchen cabinets that are a notch above HD / Lowes cabinets that are ready to assemble? 

try http://www.cabinetgiant.comIF you've never done RTA (ready to assemble) its super simple.  

We assembled the home in under 12 hours.

My husband and I are starting our REI journey and have assembled a team in the area where we'd like to buy (not out-of-state, but 3 hours from where we live now where prices are more reasonable).We have a great lender, got approved, and are ready to buy.

Nevertheless, there is a method to obtaining your answer, and it involves many of the things Christopher mentioned.A bit longer answer is, it requires experience to assemble a team to help determine those costs.