^I've never been good at compound curved surfaces in Sketchup, so I am interested to see how you manage it.
My approach is basically to take a page from building physical scratchbuild models: create a framework on to which you can lay a "skin" to form your compaund curve surface. This would be much like an airplane fuselage or boat hull frame. I've already done this to a limited extent with my TAS and TOS shuttlecraft 3D models. But the Phantom Cruiser
is much more complex in form so it will be a challenge. Yeah, it is time consuming, but at least I know I'm getting the shape I want.
Mind you there are a lot
of plugins for SketchUp some of which could well make this easier, but it takes time to find the right one and learn how to use it.