I think the niu glyphs in line Ca12 could be referring to the 'overshadowing' Tree - in Polynesia adjusted from an oak to a coconut tree. This niu should be representing the Milky Way, oriented as a standing tree rising up from the core timber of Argo Navis:
It stretches all the way up to Cepheus:
Aquarius is not in the Milky Way. The 'river' from the Urn is located around 23h, and whereas indeed the Tree stretches from Argo Navis around 10h-11h up to ca 22h-23h at Cepheus, the declination of Aquarius is not high up at the pole but right across the ecliptic. But in the perspective of time declination does not count and Aquarius is in the same place as the top of the Tree. In time the stars of Cepheus are mixed with those of the Aquarius stars, and they are rising together heliacally in February and seen in the nakshatra sky close to Moon 6 months later, in August. Likewise the stars at the bottom of the Tree, those late in Carina (such as Simiram), are located together with those which are high up at the upraised left foot of Ursa Major (Tania Borealis, λ, and Tania Australis, μ):
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