Thanks for the responses guys. NIce to know the pieces are interchangable between games. I have played another game since and we all seemed to make lots of mistakes. An experienced player would smash a new person at this game.
smanifesto I will probably do exactly as you have done and get a pieces from other games. It was getting frustrating having to constantly look for new units and swap chips around. I’m also with you on customizing the game a bit. We already have a house rule that battleships have to return to a factory to be repaired at the start of your next turn when damaged.