I have seen some insurance people say you can cover this just as well by getting enough liability coverage...which I also have (for the LLC) and may be  true. 

As far as loans for the purchase look into sight unseen loan programs for auctions Gives you 85% of the purchase with an adjustable rehab budget that covers 100% of the rehab upto 70% of the arv (Most of these properties you will not be able to get inside for an appraisal or to formulate an accurate construction budget) 

Is there places who will lend to cover the DP?

From what I know some PM companies will not service these properties, rents are so low that even a 15% PM fee will not cover for basically twice the work and all the issues that come with that territory.

(Not a live in flip) He also was wondering if he should refi his house, pull 75k out, pay the vehicles off and put the rest down on a new house. rent the original house out and take that money to pay the refi mortgage, the rent would cover the mortgage plus an extra 150 per month ..I’ve been telling him about refining his house and use that towards a BRRRR or some other real estate investing.

That would outline the terms of the lease - rent, security deposit, property condition at move in, lease end date, lease term and anything else that a lease should cover.

The biggest concern I have is that most individuals in my network will not be able to cover the whole $100K purchase......and I wonder about having 3-4-5 private loans and the costs/hassles associated with that.  4th lien position? 

I ended up doing heavy marketing to find motivated sellers myself. 

Principal, interest, tax, insurance, maintenance repairs, capital expenses, utilities ( if there are any the tenants won't cover), vacancy.  

Yes you'll use leverage to make up the debt difference but this time your back is covered with the bed rock of the cash properties.the quicker you can get your husband comfortable with your financial position the quicker he'll be out there hustling flips with you full time.