Great that it’s starting to work!
For now the “interior” is not something you’re supposed to view, I’m hoping in the future I can work on the fact that it becomes extremely foggy when approaching the denser regions (or otherwise the centre) of the atmosphere but for now this is what happens.
If you want a object to be semi-visible but still foggy because of the atmosphere you scale the sphere to be close to the size of the atmosphere, not exactly although as that will in all cases fully obscure the atmosphere.
You can increase the transparency to be somewhere around .95 if you want a very see-through atmosphere which will in turn probably fix the issue you are mentioning.
Hope this answers your question and I wish you the best of luck in your game 
!