A yakata for the kobaya?

I’ve been looking at the yakata, or deck cabins, on the paintings of kobaya. Also, there is one from a larger gozabune that was removed and restored and on display at the museum at Kumamoto Castle. I’ve been in touch with ship modeling colleagues in Japan and they told me that it is from a ship called the Naminashi-maru (波奈之丸).

I’m still very confused about the dimensions. To me it looks very low, but I’m told the lower level is 1.7 to 2 meters high on the inside. Part of this, I assume is because the floor is below deck level, which is the case on my kobayabune.

To aid in design of the yakata, I’ve fitted a removable cardboard structure. This gives me a sense of size and appearance. I can’t really add the structure without the attendant framework over the whole ship for an awning.

I drew in some outlines for sliding doors and a railing atop the structure. Apparently, the passengers would also sit atop the structure. I’m not sure how they would climb up, but I’m assuming it would be with a “leg up” from one of the attendant samurai on the deck.