With its rusted metal roof and mismatched wood exterior, the cabin that houses the Blade Bar, a knife shop in Ben Wheeler, in northeast Texas’s Van Zandt County, looks like an exhibit you might encounter at a living history museum. It once belonged to the late Dan Harrison, an internationally renowned knife-maker who created custom knives for Lyndon B. Johnson and Queen Elizabeth II. On the February day I visited, two children, who turned out to belong to owners Johnathan and Rhiannon Sibley, ran around the front-porch swing, sucking on rock candy lollipops. Across the street, diners were enjoying burgers and beers at the Forge Bar and Grill, a restaurant in an old blacksmith shop that now hosts live music in its sprawling outdoor area. My…