I currently have 20k saved up, but my dilemma is that I have no verifiable income sense November 2023.

Things that verify data the applicant provided like when they lived or worked there, how much was rent or their pay.

spokeo (reported as lousy)places that cost money:TLO ($1)peoplefinder, intelus ($25), find the seller.com($20per search) been verified($60yr), accurint (expensive and hard to get acct), privateeye.com

We have been informed, and verified, that Blacktip has approximately 30 cases in litigation in Lee County, and approximately $150,000 in accumulated judgments against it.

Just looking to verify as I'm setting up LLC docs. 

A professional foundation inspection to determine root cause and verify the neighbor is at fault.

Heloc is a full documentation loan meaning that they will verify your income and credit.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Not sure of your area, but I would definitely get a quote from a broker/agent to verify.

Other than that all the underwriter needs to verify is your income, assets, and liabilities to make sure you can pay for your mortgage and low risk of defaulting.