Wow. Those look really great! How many pieces would be needed for a regular sized map?
The existing 4 maps are calculated with 504 hex fields laid out for 4 players. So it's calculated with 126 hex fields per player.
One modular segment tile is 7 x 7 x 7 hex fields = 28 hex fields.
So you need 4,5 modular segment tiles per player, for a 2-player game 9 modular segments, for a 3-player game 13 or 14 segments, for a 4-player game 18 segments and so on.
I think this ratio gives the best playability so the game field is not too small to start conflicts too early but is small enough to trigger conflicts after developing your position.
But this is only true for the compact, four-side map as with printing such a map you're restricted to these format due to production reasons.
But now with these modular segments, you can think about completely different scenarios and the simple ratio "hexfields per player" is perhaps not valid anymore.
You can lay / design scenarios with gaps, vast mountain and sea regions, bottlenecks, very stretched layouts, etc., etc.
This has far more impact on the tactical and strategic plans and scenarios so the simple ratio may become less important.
With these modular segments you can think of more enhancements, for example introducing scout units to explore new landscape of the planet, which could mean adding new and unexplored segments during the game - for example.
I've not completely thought about this but this is far more flexible than "only" to build another four-side basic game plan.