I mean no technical problems around additional planets. The core game still use the original small scales for playability what cim described here
. Let's see:
1. Ship scale
The mentioned Re-scaling experiment do steps around this scale.
2. Planetary scale (100 times smaller than ship scale)
In FarPlanets I created realistic planets up to the size of Mars. Larger ones produced graphical problems with the current OpenGL engine.
3. Solar scale (25 times smaller than planetary scale)
To get 2,500 times bigger suns all planets must be moved much farther than now and probably cause other problems, for example at sunskimming so this is not planned by anyone yet.
4. Inter-planetary scale (1000 times smaller than planetary scale)
is the proof that real inter-planetary scale is usable if we also add enough fast travel methods to keep it playable. At least if we not count the effects of the small sun like it show as a star only at that far and no bright side of the far planets due to the low light.