Description:
Since the crossbar was built some months ago for some other part of the cockpit, it is not a 'clear design', I just used what I had.
It consists basically of two L-shaped alu profiles mounted together to form a U-shape.
I added another L-shaped alu profile to it, which led to this setup where I had to cut out those two bent-out parts to reach the screws that hold the third L-shaped alu, as seen here.