At some point 8-10 years did a portfolio loan with good tax returns and ended up using a lot of cash and that loan to buy 2 strs in Myrtle- ocean lakes. we currently have 20 units and Two are str's.theres really no short cut, we built a ton of equity by buying at the right time and fixing up ourselves (I'm a contractor).wr bought the two strs in 2020 and 2022.

Is bizz done this way on DSCR loans or No. ?

Ground-up financing in rural (I assume since they are "cabins") is often pretty difficult, but there are loan products available.

What type of loan are you looking for ? 

It's going to be very difficult to secure an investment loan on a STR with bad credit.

I'm sure my cash flow could vary based on the loan I would receive since I could use a first time home buyer loan but lets assume that I use a 30 year fixed FHA mortgage at 7%. 

If your rentals have a small loan amount remaining and you still have enough spread in between from your current loan amount to the loan to value and if that's enough money needed to fund your next deal then the Heloc will make sense for you.

The leases end in October and August, so if I were to buy it with a loan I would eat a part of the mortgage for four months on one property and six months on another.

Please tell me where interest rates will be when you finish your construction loan and need to put in permanent financing?

I know I have other options like selling the notes or partialling, but this question is more focused on taking collateral based loans against the notes.