It is now one week since I joined the port deck and float, I have not had time to visit the workshop since then, but here is an update on last weeks progress.
Workshop overview with the Sb float with deck, the port deck waiting for the float on the table and the port deck ready for final preparations:

The Sb deck came out very even and fair, will not be much filling and fairing:

I started to make the deck to side radius using Jay's idea with a part of a 10cm PVC tube with a piece of
MDF attached to it. I have not yet come up with a good solution on how to attach the paper to the "board":

Now joining port float. A hole in the deck and the table to receive the chain plate:

Deck and bulkhead flanges are filled roughly and sanded down with the
longboard. Hole in the beam bulkhead to receive the dowels mounted in the table...:

...and trough the deck at specified position:

After vacuuming and
de-greasing I started to apply the epoxy thickened with a mixture of
microballoons and microfibers. One of the rare pictures of the boat builder due to a visitors appearance in the workshop:

Almost ready for joining....

Applying "bog" to the last part of the flanges:

And with help from the visitor the float was turned up side down, slipped right in to the dowel holes and then strapped to the floor while curing. You can also see the proud owner of two joined floats: