That sounds decent, I use caltopo on Backcountry Navigator as my main map any I like it.
Just really started playing with Google Earth recently beyond just taking cursory looks at areas I was already planning to go into. Trying to really learn how to get the most out of it. The ability to tie in with the same maps I already use with GE would be great.
Now I just have to figure out the whole import/download/layers thing.
The great thing about this approach is that you have caltopo as your source of truth for all map data and it syncs over to google earth any changes automatically. Then you can see all your data using the great 3D tools that are in google earth without having to redo all your waypoints and layers.
Don't forget, caltopo has a huge variety of map layers, as well as private/public land boundaries, current and historical wildfire data, slope shading, sunlight and ground cover analysis, snotel and weather data, etc. It's really dense and really powerful, and it's all free. I recommend going through their blog to learn more of what it's capable of, I'm always finding new features.