The portside floater of the Hermod, at Mitsui Shipyard in Tamano.

Both floaters were built as normal ships, on a slipway.
After that, both floaters were put in 2 drydocks next to each other, at the correct distances.
Then the 2x3 legs were installed.
The main deck consisted of 3x3 modules, which were installed subsequently.
After that the deckhouse (as one unit), and both cranes.