In reality, I would not look to adding secondaries to a ship. We are looking at that in 1/72nd for the battleships, not because of that is the way they were, but because they are so vulnerable to the destroyers and light crusiers, that they need the secondaries to stay in a firefight.
If you are on your own and are looking at starting your own club, look at the rules that we have in our club and feel free to use them to set a basis for your own club.
http://www.nwlink.com/~pfleming/QORulebook...ok_8-22-02.html A big problem in arming a lot of guns is expense. If you start making the boats too expensive you will have trouble attracting new members. Also the game should not be about destroying each others ships, but about having fun in trying to build a strong well working and good looking model that fights.
I like the way that our club is set up to build accurate models with a limited amount of guns so that you can be proud of the way your boat looks and you can fight the boat without tearing each other up.