And thank you for sharing this because yes there lot of variations to what I'm describing.  

I am sure you could come up with a number a variations of this strategy to both get the deal  done and lower your risk. 

I consider this to be the same as an add-on product, since it is only available for a significant additional fee.To try to keep this simple, I’m not going to get into all the variations that we see with QuickBooks.

Variations of this kind of 'problem' has been discussed elsewhere on BP, for instance in posts throughout: http://www.biggerpockets.com/forums/517/topics/64615-corporate-owned-wholesale-reos-not-on-mls?

There are so many variations on the specs of each that you'd really have to do a bit of homework beyond the generic names.  

I learned a lot, not only about real estate, but about a variation of poker called "Up the River, Down the River."

(please fill in the blank)I've done the analysis (well, quite a few variations of what-if scenarios using ideal conditions, bust market conditions, and everything in between) and believe the annual cash profit will be about $29K in year 1 (excluding appreciation, tax benefits, and rent increases)So there's a good chance that at some point soon, possibly sooner than later, I'd be relying on the success of this three-quad plan to 1) pay back the HELOC, 2) pay back the mortgages on the quads, and 3) provide me and mine with living expenses.Does this make sense?

They'll be close, but with variation.

I am very familiar with how the 70% rule works and have read several posts about other variations of the rule.

You could partner with someone who has good credit, and maybe some cash to kick in or some variation of that, 50% of something is better than a 100% of nothing.Your final option is hard money lenders, but rates will be very high and they will be very thorough on the deal and with out a track record may be a tougher option.