Stock Ships or Legacy versions?

Hi all,

I'm starting up a new tramp freighters campaign. Years ago, when I played this game, we got a stock freighter and modified it ourselves, but I like the story hooks for the modified/legacy ships in the Stock Ships book. My only concern is that giving them a ship that's already heavily modified might take away the fun/milestones of customizing it themselves. In your experience, are they too much to start with?