An insert for the game White Castle + Matcha expansion, which fits 100% gameplay content in the base box (with sleeved cards)
Tested to also fit promos 1 & 4 (which I have), but given that promos 2 & 3 add a total of 4 cards, I believe they should fit as well.

What fits in the base box:

• All player pieces
• 4 player boards (expansion version)
• 20 dice
• All multiplayer cards (sleeved with 60micron sleeves by Sleeve Kings)
• All cardboard tokens (money, daimyo seals, training yards, ceremony, water lily)
• Round marker
• Rules booklets in one language (base game + expansion)

What doesn't fit in base box:

• 4 player boards (base game version)
• 4 bridges
• Solo cards
• Remaining rules booklets

Compromises I felt I made while designing this:

• Herons (and +40/+80 tokens) are stored separately from the player pieces.
• Fitting the yellow player pieces in their container isn't straightforward.
• Couldn't fit the bridges at all.

Things to notice when trying to fit everything in the box -

1. In order for the dice container to fit properly into the grove of the player boards and sit flush, the daimyo seals need to be arranged in a way none of them are sticking "above" their respective container.
2. Fitting the yellow player pieces is done by placing 4 meeples laying down in the deep part of the container (with resource/vp between them), with two rows of 5 meeples standing over them. Then it's 3 meeples laying down to the right, and 3 standing near the top.