Hmmm I was sure I was covered with 125 mm duckt, with the two 125 mm duckts I had in the attic and a 160 mm as well.
Turns out I had one 125 mm and two 160 mm duckts, so got to go buy more of that.
Moved on to the drains.
I had to get creative, as I wasn't able to find bulkheads. That would fit my drain pipes, and the drain pipes that would fit bulkheads.
Well let's just say I don't wanna pay the price, and wait for it to get here.
Not a problem!
Drilled the walls in the cabinets, with a cup drill slightly bigger then the collar of a 45 degree 50 mm drain fitting.
Then I cut four plywood squares, and drilled them with a cup drill.
With the same diameter as the drain pipe, mounted that on the outside of the cabinet end wall.
After the glue had dried, it looks like this.
Once everything is put together, I will fill out the gab around the fitting with silicone.
And in the end, it will be coated with a thin layer of polyester resen, maybe some fiberglass as well.
The finished drain will look like this, but clearly I will need to get the ventilation done first.