He'd need to run his own numbers to tell me if this is true but my assumption and belief was that getting half the profit on a good flip will net him a larger margin on his efforts than he's normally getting on projects in which he has no vested interest, and for which he went through a competitive bidding process.  

you need to be careful of making assumptions about me or my standard of living - it comes across as lacking tact.  

I guess the assumption is that you will want much below market to househack (though I don't know Georgia that well).

We once got a really nice custom storm door from the bargain section for a steal. 

It really depends on your ENTIRE situation, so making assumptions like "it's easier since it's government backed" will only make the process more complex than its needs to be.

Also, its good for customer relationships.  

Steve, there must be written consent for an assumption in a seller financed note, best to include some reasonable parameters, consent not unreasonably withheld.  

Some updating in the kitchen sink and baths included new granite countertops and Custom vanities and Cabinets.

For conventional type loans in your personal name just go with the cheapest rates and best customer service.

Your assumptions seem to be reasonable.