This idea really is straightforward, since Lego already has parts for it from Star Wars sets Planet Series 1. That is, the hemispheres. All Lego have to do is create new worlds print patterns.
The basic idea is that “Worlds of Solar System” set that has all worlds and optionally, SOL and dwarf planets like Pluto, so people can display them for various reasons. The sizes are all same so no new parts would have to be made.
Realistically, probably only Earth would be the “Must have” world.
Make this come true, people! I can see many uses for those worlds. And not just as background creation!
Note: I just made picture with inkscape, so studs really is not to scale to what it would really be.