Oceanic Union Defence Forces and the Islamic Federation

Both fleets use modular weapons fits which can readily be swapped out. These should be costed as ship construction, not spare parts. So they count towards your 4000 pt cap on initial ship construction. They do not attract maintenance costs while not in use. They have to be placed in pre-designated locations. It takes a week to swap in a module. You can't swap two modules into a ship at the same time. Where the simplified fleet rule for maintenance is being used, the benefit is not suspended simply because module swaps have led to more than five distinct ship types, so as long as no more than five hull designs are being used at any one time.