Cook lasagna noodles according to package directions. Drain and set aside.
In a large mixing bowl, add the shrimp, scallops, crab meat, and clams. Combine and set aside.
In a large saute pan, heat the vegetable oil. Add the shallots and cook for 1-2 minutes until tender but not browned.
Pour in the chicken stock and bottled clam juice. Bring to a boil. Add the seafood and cook for 3-4 minutes until the shrimp begin to turn pink. Drain reserving the cooking liquid.
In the same saute pan, melt the butter. Add the flour, whisking continually until the flour is smooth.
Stir the milk slowly into the reserved cooking liquid. Pour gradually into the flour mixture, whisking continually. Cook for 2-3 minutes until thickened. Add garlic powder, cayenne, salt, and pepper to taste and heat through. If the sauce seems too thick, add the reserved clam juice a little at a time to thin it.
Remove from the heat and stir in the heavy cream and 1/4 cup parmesan cheese.
Add 1 cup of the white sauce to the seafood mixture and stir well.
Butter a 9x13 baking dish. Spread 1/2 cup of the white sauce evenly over the bottom.
Place 3 lasagna noodles across the bottom of the baking dish side by side so that the bottom is covered.
Evenly spread 1/2 of the seafood mixture over the noodles.
Spoon 1 1/3 cups of the white sauce evenly over the seafood.
Repeat the layers. The last layer of noodles will not have the seafood included. It will just be finished with the white sauce.
Sprinkle with the remaining parmesan cheese and chopped parsley.
Bake in a preheated 350-degree oven, uncovered, for 40-45 minutes until lightly browned and bubbly.
Let rest for 10-15 minutes before serving.