...How?
For all we know, this is the first warp ship, and the very same one we saw in the movie. Even after scoring the first warp flight and supposedly winning a contract or two thousand, Cochrane probably couldn't have afforded to build new models from the keel up, not immediately. So he'd ditch the original crew pod (which might have been expendable anyway, landing on parafoils while the warp engine remained in orbit) and bolt something heftier there for more extensive test missions - say, a flight to a nearby star. A few extra fuel tanks, a primitive shield against wear and tear from interstellar dust, a high endurance crew pod with landing and takeoff capabilities (and a "Cochrane Industries" registry number!)...
Timo Saloniemi