@Travis White
Before answering your specific questions I wanted to point out: You don't have to use the 70% Rule, its just a rule of thumb for flipping, but if you did the max you would offer for this would be $119,500. If you bought it at that price it would be 34% CoC with only about 10k left in the deal. For your specific questions in order:
-The CoC return in this case is one year of the $292/mo cashflow divided by cash left in: (292*12)/29000 = 12%
-Holding costs - yes! Holding costs are usually: property taxes, insurance, utilities, HOA, landscaping, financing costs. So for the 3 month rehab you will pay all those things, and the financing costs will be that 14% HML interest until you refi 6 months later.
-Putting more money down so that you have to borrow less HML will result in less financing costs overall, with everything else being equal will result in less cash left in the deal.
-Up to you on personal criteria, but a perfect BRRRR would result in no money left in the deal or even ending up with more than you started with.
-No I would stick to the 70% rule
Hope that helps!