Crab Cake Mac N Cheese

Name: Crab Cake Mac N Cheese
Ingredients: Salt; 1 pound cavatappi or elbow pasta with lines on conchiglie (small fat tube/shell shaped pasta with lines); 2 tablespoons extra-virgin olive oil; 6 tablespoons butter; 3 ribs celery with leafy tops, finely chopped; 1 medium onion, finely chopped; 1/2 small red bell pepper, seeded and finely chopped; 3 to 4 cloves garlic, finely chopped; 1 bay leaf; About 2 tablespoons freshly chopped thyme leaves, several sprigs; About 1 tablespoon grated lemon zest; Freshly ground black pepper; 3/4 pound fresh lump crabmeat, picked for shells and flaked; 1 tablespoon seafood seasoning (recommended: Old Bay); 3 tablespoons all-purpose flour; 2 1/2 cups milk; Freshly grated nutmeg, to taste; 1 tablespoon Dijon mustard; 1/3 pound, about 1 rounded cup grated sharp white Cheddar; 1/3 pound, about 1 rounded cup shredded Gruyere or Swiss cheese; 3 tablespoons hot sauce (recommended: Frank's Red Hot); 1 cup panko bread crumbs; A generous handful flat-leaf parsley, finely chopped; 1/2 cup grated Parmigiano-Reggiano cheese, a couple of handfuls