Too risky to trust your money to any automated system.The sales comparable approach to value will dominate regardless of cash flow if it's a single family home or 1-4 units and is being financed. 

Traditional lenders will want to see a proven track record and will want to lend against a much much larger portfolio of notes.Honestly, the timeframe is highly dependent upon you.

In 2014, she bought the 650-square-foot space on East 12th Street for $749,000, and planned to continue living with her parents on East 11th Street during the renovation.Four contractors estimated the work would cost around $120,000 and tried to steer her toward a more traditional look, raising concerns that creativity could cost her buyers

I compare this to what a commercial building might do when an office tenant wants a buildout.

So what is your property worth compared to the mortgage you have on it?

In my short experience, the typical HML I’ve seen generally loan at 25-30% LTV with a note duration of 1-3 years, with the main benefits being a typically fast close and not having to go through a traditional lender for a Fannie/Freddie loan.

@Tim Schroeder I am not sure on the Traditional side of lending like FHA, but we have done similar to that and are planning on doing it again with our commercial portfolio lender.

Even if the deal goes good, there is a good chance that splitting the money so many ways the GC will lose money compared to what he would make if he just worked for someone else doing the same thing.

I believe that you CAN convert traditional funds over to ROTH AFTER they are in the SOLO401K thought. 

Go on YouTube or google how to compare properties.