Is the process as simple as finding a local builder (one that was recommended has 15-20 yrs exp.)? 

In my experience, keeping things simple and straightforward with sellers works best.

I do have a contractor bidding it tomorrow, I was just hoping someone would have a rough $/LF or something similar to use for a ballpark, but figured it may not be that simple since it of course depends on specifics.

The reason behind that is simple: maintaining infrastructure for low density single family housing is cost prohibitive. 

Regarding your 2nd floor kitchen faucet that is experiencing low water pressure, it's likely a simple fix such as the faucet aerator (a screen that helps create a smooth stream of water).

While it’s relatively simple and can help you find deals, it’s also time-consuming.

Truth be told, what you need is in fact very simple and where most make mistakes is actually in their day to day operations.

Though, I wanted the form to be as simple as possible for the sake of not scaring off the seller (it was also direct so simplicity is often key in my opinion).

It’s relatively simple and, while it does cost money, it’s one of the more cost-effective options.

It was simple and cheap.However, it still takes time and money to set up and maintain the LLCs.