It should be pretty accurate - high level data sites are not always going to be perfect, but should always be directionally correct and AirDNA has a pretty strong track record. 

To a point made by another person who commented, you may be able to have a lender do a 'one-off' portfolio loan at a 95% LTV if they trust you enough . good luck.

I think the before vs after pictures really speak primarily to your experience and ability to execute a project so it can help lenders gain comfort with future projects and allow you demonstrate what level of detail you except out of your contractors.

We could not do this without the trust of our clients and referral partners.

The lot is flat and level, so we only need a short gravel driveway.

They also have to trust you.

I got the property off-market for $250k from a trusted family friend.

They have many servicesWe used them for our living trust -didn’t deal directly with mark but people were Knowledgeable and was easy to work with

If you like the idea of a self-directed HSA like @Kaaren Hall mentioned check out providers like Accuplan and IRA Financial Trust. 

Sellers will lie to you and you have to "trust but verify"It's your problem.