I think this is a good plan. I posted in the Market the new images of the completes board and blank pieces my dad made for me.
Rules pending.
Let's consider a lit of tiles and a generic set of rules that all nations know before creating the nation specific variants.
Tiles:
White Lotus (only one)
Wheels (how many?)
Swords (how many?)
Ships (how many?)
Chrysanthemums (how many?)
What other pieces are there you think?