Originally Posted by Valgor
Would the player be able to buy a different configuration anytime they wanted to, or would the game present them with a predetermined selection of configurations each time they achieve
I'm not entirely sure. The natural option is to allow the player to change ships as many times as they want. The problem with that for me is that the player loses a sense of the restrictions they have to deal with and what they need to advance, which is so critical in an ARPG. It also increases the shuffling of components between ships.
So my preferred solution would be to allow buying/switching to a new ship when you level your command, and between sectors. It makes a little less sense from a narrative perspective, but not swapping ships at will means that you have harder constraints to deal with and I think that's a good thing.