What we are saying is that we claim the crashed ship in order to salvage any bits regardless of how decent it is, and then go back to the ship we were already using. The trouble is, the original ship isn't there, it either disappears or you can't access it
I got that ship using the method described (trading up). I suspect there is a limit to how many ships you can own at once but no option to get rid of any of them.
Finally making some cash now I've gotten used to it by farming the larvae eggs at abandoned labs using the base building tip which I suspected might be possible.
And finally worked out the nanites upgrades as well, not many guides out there to do with NEXT at the moment. The S class scanner upgrade is well worth getting.