I tried calling around the respective govt bodies, but wasn’t able to get clarity on whether out-of-state investors can setup such a facility.

This will be a Joint Venture with the builder.

Now you see why builders can't just give you a price/sq ft. 4.)

I am a licensed builder in the charleston area that is from Myrtle beach.  

If you have experience in managing construction, then you should feel comfortable filing an Owner Builder permit.

In inventory-constrained areas pre-construction SFHs can be a great way to get new construction at decent prices (the builders have real economies of scale so they can build cheaper than you and me).

Who can i speak to in the construction/builder space that could help me get an understanding of costs /planning for a new build.Thank you 

For my 2nd home that my wife and I currently live in, we were able to obtain a 5.5% rate through the builder DR Horton for a new home.

Any referrals for good builders would be greatly appreciated!

Second, you need a builder/general contractor.