Nagamer In fact (even tho I'm obviously no mod and you should be free to ask that in the pinned forum rules thread) you'd probably do worse by deleting it. As a guideline, I usually leave the original creator and add a 'mod by Phantom' behind that, but you may also do it differently as long as you leave the original creator somewhere in the data. (Some peeps seem to put the name of the original creator in the ship description for example or leave them in the 'by' section and only put their names in the description.)
Tho again, that's only how it's usually handled. You'd rather ask Walt or the respective ship creator to be on the safe side.