Using HELOC to fund deals ?

[Joseph Niedermeyer]

We are planning to build our personal home in the next couple of years. In the design phase, I'm intentionally wanting to add features and value to later use as part of my long term funding strategy. We are a family of 5 so adding a couple of extra bedrooms, an extra bathroom per floor, a separate living space on second floor, extra garage space, brick/stone exterior, upgraded flooring and countertops, lots of closet space, etc. All will make our home more comfortable to live in but it will also add value that we can then use to fund future deals. Using the BRRRR method, we can Buy, Rehab and Rent it out without any need for outside funding or approval from anyone. Once rented, we can refinance with a traditional mortgage, pay off the HELOC and Repeat. Eventually completely paying off my personal home to where all I have is the HELOC available for more deals. Is this a good strategy to simplify the process of "finding" money for deals? Or are there hidden down sides I've not considered?