From my limited observation talking to a few who have built their place, it is very hard to beat the big developers in price per Sq foot unless you do the majority of the work yourself.

And you plan on being the General contractor etc…

Anyway, maybe a limited subset or people who tried this, but most were BURNED!!!!! Very badly.
Some never completed or were forced into BK or near BK.
try to buy something existing if you are not going to be doing the management and most of the nail pounding.