A storm on the east coast can delay material delivery on the west coast.

I'm still not really understanding what you're suggesting as an alternative.

In my state sellers are required to disclosure material defects except in special cases such as estates where there is nobody with first hand knowledge.

Is there an alternative that a bank would be cool with?  

If you are trying to get alternative financing from the seller then it is advisable to meet them in person.

What kind of leverage you have if any in negotiations will generally depend on the quality of your site for their business type and what alternative choices do they have in the marketplace?

I still may end up being on the wrong end of things when renegotiations are done, but I want to come prepared with alternative proposals.

Ideally, you would work with your tax advisor to determine (1) if you are a real estate professional and (2) if you materially participate in the rental real estate activity which you referred to in your OP.

Alternatives to hard money for Fix and Flips?

Depends on how confidant you are about the margins & if you can in fact materialize the profit.Here's an example (from my old agent friend) of what we are dealing with on comps for a property near this one that just sold...Listed. $599,900Sold. $675,000Days on Market. 8Obviously multiple OffersRoy.