For land, mostly you have to purchase with cash unless the builder is giving financing.For construction, most of the traditional lenders are ready to fund full if you are planning to live inside. 

The other factor here is you are the builder selling brand new construction and already anticipating construction quality issues.

Manufactured home builders have raised the bar on interior quality, fit, and finish so much as to now be on par with site built -  and at somewhere around half the cost of a comparable site built house.   

Are there any local high-end builders in Dallas willing to chat about the process they go through on the financing side as well as the sale side of things?

Old Homes Pros: Tend to be in better locations closer to amenities and main attractions, more likely to be walkable, often have larger lots, houses and surrounding area have more "character", sometimes they have features like old growth wood and other elements that add value and longevity, no HOAs; Cons: Near endless potential for expensive issues of every type because of the impacts of time, neglect and old building materials and methods, require more work and money to make them modern and appealing, can be tricky to financeNew Homes Pros: Far less maintenance and potential for issues and may still be under the builder warranty if issues do come up, modern design elements and fixtures, often in good well-funded school districts; Cons: Homes and neighbrorhoods have a manufactured feel and less character, lots tend to be smaller because developers want to pack in as many units as possible (especially in high $$$ markets), tend to not be walkable because the areas adjacent to the best attractions/amenities have been built on already, sometimes built with low end materials, HOAs restricting what you are allowed to do to your property 

Full transparency, Im a builder and will build several homes on this lot in the future.

Mortgage, title, agents, movers, spec builders, etc.   

Most builders will not give a concession to someone who comes unrepresented.  

Moreover, make sure they actually have contractors /workers ready when they call, many of these builders have trouble finding workers and have a poor system in place which can cost you time and money.

I have a real life shark tank scenario happening this week .A friend connected me to a billionaire who is always looking for deal flow..My friend who is a builder in FLA has agreed to give me 10% if I find investors for his projectsWe have are pitching a 22million dollar condotel on the water and also a 46 million STR on the beach..any advice before the meeting would be appreciated, I am a fairly new to real estate and a bit nervous.