I think I can get a policy online with the other requirements, but this waiver seems to be more difficult to find.

In order to get the attention you want through online ads (which last I checked Facebook ads require such a wide range for the demographic that it is almost not worth it), you would likely need to spend literally thousands of dollars. 

There are some places online too that have cookie-cutter blueprints too that you can check out as well!  

@Helene GoodworthTo expand your network, identify your areas of interest, highlight your construction skills' application to investment projects, actively participate in local and online groups, and seek mentorship and guidance from experienced investors.

I only found an online one but some one else may give more inputshttps://www.meetup.com/real-estate-wealth-institute-indianap...

The photos online won't be of much use to you as the photos where the money spend is at are in the basements, attics, and the exterior of the house, and every corner of those if that helps.

Or maybe the ESA letter is from a bogus online source that isn’t acceptable.

It should be on line, look it up.

Does anyone have a recommendation for online calculators to map out the breakdown of monthly interest payouts easy?

It offers a secure and transparent process for both buyers and sellers.NoteTrader Exchange: An online marketplace where you can list your note for potential buyers.LoanMLS: A marketplace for buying and selling mortgage loans and notes.FCI Exchange: Another platform where you can list and sell your notes to investors.Note Investing Forums and CommunitiesBiggerPockets: A popular real estate investing community where you can network with potential note buyers.LinkedIn Groups: Join groups focused on note investing and real estate to connect with potential buyers.National Note Group: An online community where you can connect with other note investors.Note Brokers and BuyersNote Brokers: Engage with reputable note brokers who have access to a network of note buyers.Local Real Estate Investor Groups: Attend meetings and network with local investors who might be interested in purchasing your note.Financial InstitutionsCredit Unions and Community Banks: These institutions may be interested in purchasing performing notes.Private Equity Firms: Some firms specialize in acquiring performing mortgage notes.I hope this give some direction regarding your situation.