This deal was the catalyst that got me into the mortgage banking industry.

With the exception of building a trailer on the property (these are hard to finance), this sounds like a good plan AND if you are using it for your business AND your business pays more than 50% of the rent (if you have more than 1 tenant), then this is a more financeable property in the eyes of banks and credit unions as it would be consider a commercial "owner-occupied" property. 

Should I be concerned the bank may have issues with this? 

What's your income and how much money do you have in the bank would be the first thing I would consider.

Realistically, one checking account and an accounting system will meet all your needs and keep your business better organized than 7+ bank accounts.If you want to collect bank interest from excess cash, add a savings account.

In my experience, you can absolutely use hard money in bank owned reo auctions...you still don't generally get access and thus need a lender who does need an appraisal in this scenario. 

There are also additional costs of operating and maintaining an LLC, like separate bank accounts, annual report filings, tax filings, etc.2.

I had two lines of credit one unsecured for 5 million ( check book) and another for 10 million that we would secure them up with .. but you need time to do that bank required appraisal etc before we could tag the secured line and even at that they only lent 72% in these commercial loan structures..

Should I talk to an appraiser before the bank gets an appraisal?

The property is zoned as a SFR house and likely in a neighborhood of the same.Was the property not appraised by the bank when you got your mortgage?