Bob. The clue as to whether to have rivets or not is featured in the title of your thread "ship of the future". This precludes riveting I believe…
The plating is very thin as a missile would go through any amount of armour that you could reasonably fit, so they don't. Good subdivision, damage control and system redundancy is what you get nowadays.
In any case, you are using HARD board….so no worries on the armour front.
Ashley