Simple image depicting the launch of a Vanguard-Class battlecruiser from the planet she was built on. Here, heavy lift counter-gravity repulsers push the hull into orbit while a pair of Dagger-Class corvettes stand guard.
There are a good number of compelling arguments against building spaceships anywhere except space. But if you're gonna build spaceships on a planet anyways, this is the way to get 'em into orbit! Very cool.