Someone mentioned that there are teleporters in every base and space station now to get you back to your crafted bases but I can't confirm. Otherwise yeah, there is no point to taking the time to build and spec one out only to leave it behind forever. I'm also not sure if you can craft a freighter but you can certainly land on them now, make your way to the bridge and offer to purchase it from the captain for, at least for the one I found, approximately 15 million units. I started over because I didnt remember anything about how to actually play so I'm well off from base building or freighter owning.