Aligning correct 2D roof lines with google earth is almost impossible, whereas a 3D (wire frame) can be orbited to the camera tilt for a much closer fit
There are a few free roof generators that can help to build 3D models including
Tig: SketchUp Plugins | PluginStore | SketchUcation
make sure to use this above the z=0 axis
and
Extension | SketchUp Extension Warehouse
plus you could use some of my DCs to add to or create from, each DC can be outer shelled and provided the build is a solid further bits added to it.
If you send a private message with a few jobs attached, can show by a youtube private link a possible workflow
attached sample file with DCs loaded but not visible, drag in from home tab,
#… are ones that can be outer shelled.
_… ones are a few samples of glue to roof accessories
x… ones not to be used other than a global data.