4. In order to build a Ship timbers are needed and thus a Tree has to be felled.

"... the oak had made trouble right from the start. When (in the second rune of the Kalevala) Sämpsä Pellervöinen had sowed trees, it was the oak alone that would not grow until four or five lovely maidens from the water, and a hero from the ocean, had cleared the ground with fire and planted an acorn in the ashes; and once it had started, the growth of the tree could not be stopped:

And the summit rose to heaven // And its leaves in air expanded, // In their course the clouds it hindered, // And the driving clouds impeded, // And it hid the shining sunlight, // And the gleaming of the moonlight.

Then the aged Vainamoinen, // Pondered deeply and reflected, // 'Is there none to fell the oak-tree, // And o'erthrow the tree majestic? // Sad is now the life of mortals, // And for fish to swim is dismal, // Since the air is void of sunlight, // And the gleaming of the moonlight.'

Interrupting for a while the description from Hamlet's Mill the idea of the Void should be somewhat clarified:

... β and ξ also constituted the Persian lunar station Bunda and the similar Coptic Upuineuti, the Foundation; but β alone marked the sieu Heu, Hiu, or Hü, Void, anciently Ko, the central one of the seven sieu which, taken together, were known as Heung Wu, the Black Warrior, in the northern quarter of the sky ...

Wikipedia: The Black Tortoise is one of the Four Symbols of the Chinese constellations. It is sometimes called the Black Warrior of the North ... and is known as Xuanwu in Chinese, Genbu in Japanese, Hyeonmu in Korean and Huyền Vũ in Vietnamese.

It represents the north and the winter season. Although its name in Chinese ... is often translated as Black Tortoise in English, it is usually depicted as both a tortoise and a snake, specifically with the snake coiling around the tortoise.

As the other three Symbols, there are seven 'mansions', or positions, of the moon within Black Tortoise. The names and determinative stars are:

3 * 22 + 11 = 77.

We should remember how King Charles was hidden in a Tree for 24 (= 168 / 7) hours:

... Robur Carolinum, Charles' Oak, the Quercia of Italy and the Karlseiche of Germany, was formally published by Halley in 1679 in commemoration of the Royal Oak of his patron, Charles II, in which the king had lain hidden for twenty-four hours after his defeat by Cromwell in the battle of Worcester, on the 3rd of September 1651 ...

... According to a variety of sources of the legend, the Argo was said to have been planned or constructed with the help of Athena. According to other legends it contained in its prow a magical piece of timber from the sacred forest of Dodona, which could speak and render prophecies ...

The prow of Argo is the same as the Royal Oak, this seems to be one of the messages which Hevelius embedded in his picture.

The Oak is the Tree from which the Ship fetches its members. Now back to Hamlet's Mill:

'One sought above in the sky, below in the lap of the earth', as we are informed by variants, but then Vainamoinen asked his devine mother for help.

Then a man arose from ocean // From the waves a hero started, // Not the hugest of the hugest, // Not the smallest of the smallest. // As a man's thumb was his stature; // Lofty as the span of woman.

The 'puny man from the ocean', whose 'hair reached down to his heels, the beard to his knees', announces, 'I have come to fell the oak tree / And to splinter it to fragments'.

And so he does. In several variants the oak is said to have fallen over the Northland River, so as to form the bridge into the abode of the dead. Holmberg (quoted by Lauri Honko, 'Finnen', Wb. Myth., p. 369) took the oak for the Milky Way.

At 'dawn' the ocean delivers Aphrodite as Morning Star - see at The Scapegoat - whereas a 'puny man' is delivered at 'midnight'. This hairy one could be a 'goat' person. Perhaps it is Mars because Aphrodite is Venus.