Reece O'Bryan I think this is a great way to use OPM to make your Real Estate investing dream happen. With that said you must consider the following.
1. Exit strategy for the BLC- If the LOC are from CC's then as the gentlemen states earlier you must get out from under the cards before 12 months otherwise "you will drown" in the interest. I have used this strategy, It works but I had a matching reserve(same amount in a checking acct) to bail me out in case I couldn't get out before the interest period.
2. Personal Guarantee- you will be "personally liable" for repayment opposed to getting qualified based on tour EIN or CPN(look into CPN......). You run the risk of totally damaging your credit if you don't have an exit plan.
3. Proper Use- If you go this route make sure that you use the money only for business purposes. I have seen some of my clients get upwards of 80k in credit lines and go on vacations or buy cars and or other liabilities that does not bring in a return on investment.
Keep us posted on the n your progress
If your interested PM me as I have a lender, low-cost entry market to invest in and great properties(SFR's) all under 65K that beat the 1% rule and cash flow nicely.
Good luck to you and great job thinking outside the box.