As Mjolnir said, we had a chat about it and came to the conclusion that two slots on each gunboat which could mount missiles as well as guns would be okay.
But I think I made this point aswell in the chat, that each gunboat would need to be means tested to find out where missile turrets are most effective on each different gunboat model. The reason for this is that it took me two weeks to find the best place to mount two basic missiles on a Corsair gunboat while finding the perfect balance of loadout.
However, a solution for maximum effectiveness and coverage is giving each gunboat the specific missile capable slots on the horizontal axis at the front of the ship. This puts them as close to the target as possible when jousting and gives them full coverage of each side of the ship. As most turn horizontally and not vertically, this is probably better. Also, smoke trails from the top slot tend to block the camera and hinder the aiming of the pilot.
Besides that small concern, I reckon the dedicated slot idea is the best one to go with.
Jinx makes a good point too, which is one reason why I am opposed to ammunition limits or changing the statistics. A limit on the amount mountable would not affect the hit ratio, just affect the amount of damage that could be dealt. Which is the aim here, I think.
