Chorizo Chili Potato Chip Nachos with Homemade American Cheese

Name: Chorizo Chili Potato Chip Nachos with Homemade American Cheese
Ingredients: Vegetable oil, for frying; 8 Kennebec or other white potatoes, skin on; 2 red bell peppers, charred, stemmed, skinned and chopped; 1 jalapeno, stemmed and chopped; 2 red onions, thinly sliced; Olive oil, for cooking; Two 9-ounce tubes Mexican pork chorizo; 1 teaspoon chili powder; 1 teaspoon ground cumin; 1 teaspoon smoked paprika; 1 cup vinegar; 1 tablespoon salt; 1 tablespoon sugar; Homemade American Cheese, recipe follows; Leaves from 1 bunch fresh cilantro; 1 cup sour cream; 8 ounces firm, solid mild Cheddar, finely grated; 8 ounces firm, solid low-moisture mozzarella, finely grated; 4 tablespoons tapioca flour; 2 teaspoons kosher salt; 2 ounces melted unsalted butter; 1/2 cup strong beer; 1/2 cup milk