We should have lunch sometime and compare notes.

If the deal has enough equity the lender will pay for the repairs and you can sell it for the comparable properties in the area if the market has the demand.

I swapped my traditional 401k over to a checkbook 401k and am anxious to park some money but am struggling to make that first move. 

And yes I've seller financed RE too via traditional Note and Mortgage (security deed).But I sell on land contract / contract for deed (the same) as well when:- deal price is so low that the closing costs ($2-3k) is an unfair expense for the buyer to pull out of pocket

A Solo 401k can have several "subaccounts" including both Roth and traditional pre-tax funds.

We're really trying to avoid doing a traditional loan, and don't want to commit to living in the place using an FHA loan.

That’s nothing compared to advanced thermodynamics lol.

If so, do you check off "Other" and list "private financing" (as obviously this isn't a traditional mortgage)?

She owns the property and actually built it years ago so I have no idea of a purchase price it was last appraised at about 93k in 2016 so again assuming after repairs compared to similar homes in 2 mike radius it should appraise for about 100k now.

So are you saying that its a good rule of thumb to compare the 50% rule cash-flow to the calculated cash-flow, and if the calculated cashflow is lower than the 50% rule cashflow then it's a good indicator of the property?