In reality, they are at the garden level and the two floors above.The garden unit is only about 2 feet below grade and is otherwise a regular unit... full size windows in every room, high ceiling, front and back door, separate utilities and ventilation.

The mobile home mover suggested that we pour footers for the foundation in addition to doing the concrete block or brick skirting because more banks would be willing to finance like a regular home.

I do not, will not, get in the position of owing a Hard Money Lender money when I cannot get regular financing!

For one, it becomes expensive since you can’t get regular comforming loans.

I don't think that matters as much as getting it out there, much like a musician recording music on their bed with an iphone and being discovered by regular people. 

But if you haven't bought/renovated properties regularly, and all of a sudden you get a PPP loan and start fixing up a house with the funds, that's an obvious red flag. 

Cause it's not possible for me to have a regular inspection of possible dealsI'm still at the Market Analysis process in order to select a market to start the very first step.

I regularly rent to construction crews working big projects in town and it's never failed me.

I do not know the details of your market- however, in certain markets 3-4 unit buildings will be easier to find better numbers on as sometimes the smaller ones (2-flats) are priced out of certain markets due to regular primary residence buyers buying them up too, due to low inventory. 

(You should be regularly attending networking events and the like.)But to be honest, generally it's hard to get private lenders onboard (other than close friends or family) early on in your investing career.