Anyone could suggest any tips, resources, or builders/contractors they had worked with?

We buy seller financed notes routinely and would be happy to evaluate what you have.

Financing structure?

And or cannot get horizontal financing like I can which is a huge advantage value of your lots go up at each milestone..

If you need financial help, ask under the "Finance, Tax, and Legal" forum.

I'm now looking at the financing.

Most invest in these smaller assets focusing on wrong criteria leading them to markets without meaningful appreciation and even when they do stumble across a market with strong fundamentals they do not understand  real estate finance and/or fail to exit these assets when they the appreciation event occurs wrongly focusing on rental cash flow.The ability to combine a high earning W2 with a sound investment thesis is a winning recipe but not realistic for most.

Go to a lender that actually knows what they are doing and specialize in investor finance. 

To thrive in real estate investing, you must maintain a firm grip on your finances.

When I meet with property owners, I give them all the options: quick cash sale, seller financing, list it publicly, etc.