I have ever built a FB180 slatted which was fine. (Ordered from mattress-Marquardt)
This one is a different league:
Of course, I did not pay when unpacking the package, because who already send a slatted back. If I'd better not be accepted to get a usable slatted.
Now he is unpacked and assembled. That was ever a little challenge:
The wood from the frame may be only C-Ware. Krumm and twisted. This applies to all 4 long frame parts and the intermediate piece.
It continues with the metal elbows. I would say they were slightly bent. Could I re-directed.
Hinges for the headrest adjustment. Even bent. Read with a pipe wrench set.
After everything was assembled, as I suspect by the crooked timber and the whole slatted frame is warped. Mandatory sun Sample: to be loaded up to 180 kg. With just 80 kg, it flexes a long way through the wooden slats resting on the center bar of the bed frame.
That's all I want to say no to this part.