Sometimes, you just have to knock down a few walls. When Nicola Manganello bought her sprawling 1760s farmhouse in Yarmouth, she knew she would have to open it up a bit to create some extra space for her family and friends. It’s a gorgeous, stately home, complete with oversize brick fire-boxes designed by New England architect John Calvin Stevens. Some people might blanch at the idea of updating a house like this, but Manganello knows what she’s doing. She’s been in the interior design business for decades, and she’s been a DIY enthusiast for even longer.