Interior layout would have depended on the aircrafts usage, VIP, ASW or passenger. This is the only intact aircraft, perhaps contact with the museum (
Historical Museum of Kanoya Air Base) may elicit interior photos. Website is in Japanese
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Kawanishi H8K Emily - Walk Around - Photographies - English
The following link states ""The balcony above the lobby also has a Type 2 Flying Boat display with photos, a model, and a
diagram showing the interior."
Kanoya Naval Air Base Museum