Possible Clues:

• In the ship it's hard for them not to be heavenly
• What the first parts of 17-, 23-, 36-, 50- and 58-Across all have
• Not a nice place in the ship when they're getting shot
• Beachgoer's collectibles
• Hard outer coatings or metal casings
• Beachcomber's collection
• There's nothing heavenly in the ship that gets them shot
• Carapaces or projectiles for cannons
• Taco holders
• It's hard for them to be outside what's so hot in the ship