Yes, the numbers seem to work...But, remember the 50% rule is just that -- a rule of thumb.

Remember, there are only 2 ways to become an owner of record with a good title: Current owner signs a deed with you as grantee or a Judge signs one.

All you're doing is transferring your cash from your bank account to one of the mattresses of the property...and rendering that cash dead.You are NOT saving interest charges, since you were never paying the interest in the first place (remember the tenant?). 

Remember I think most agents are terrible in general, but in this case they have a valid reluctance.

Remember that 0% CC doesn’t mean 0 payment, you still have minimum payments to make or they could charge a higher interest rate.

Ideally you want properties that cashflow when fully financed because that means that if you spent $0 you would still cashflow.

Remember you can Always payoff the loan faster.You can’t look the interest over the 30 years.

I remember when we bought our first house we scraped together every penny we had for our pitiful little FHA down payment and I prayed the whole month that nothing went wrong because we were broke! 

@Anthony Gayden I saw you were a podcast guest but could not remember that episode.

Ideally you would have had a clause in your contract that allowed or did not allow tenant placement or lease extensions during the term of the contract.