@Nathan GrubbTo add to exhaust fan, look into wiring it to light switch so that anytime light is on, fan is on.

When you start to move away from the type of experience you have had, lenders become less certain that you will be able to pull a project off.The above list is by no means exhaustive, but is a good starting point regarding the kinds of questions that a private lender would typically ask.Hope this helps,Michael

I just wanted to make you aware that a French drain is not good for fast moving water - you might still want to implement one close to the foundation, around the house (to collect and move the soil water slow accumulation), with the roof downspouts tied directly into it and with the "exhaust" further downhill from the house (otherwise, even with those extensions you placed the water will come back to the house).You can read about both making a swale and installing french drain - it's not rocket science - and hire cheap labor to dig the trenches.

Expensive but still a good deal if you've located exactly the right property or have exhausted your efforts to make your sale happen first like a contract to purchase with an extended closing date or contingent on the sale of your old property. 

As for vetting them you may want to use @Steve Rozenberg`s exhaustive checklist as I think it covers everything.

I have exhaustively searched for additional financing with no luck.

Eat in your car, take a different route to and from work, drive until you are exhausted and then do it again tomorrow.

Now I have the property ready and exhausted and need a good short term rental contract. 

Are there other, more detailed or exhaustive resources for this?

Once you've exhausted that avenue or if you don't qualify for one of the myriad reasons people don't qualify, go with a portfolio loan.