The profile ansich and the cover are well made. The shipment will be safe in a cardboard tube.
The assembly of the Alukörpers is readily possible. For fixing to drilled every 30cm a hole, countersink and use countersunk screws. The holders can save, so also the assembled profile looks better ("in one piece").
At the latest when mounting the cover, you must then go to confession. Apparently it has slipped in the table book and here produces an interference fit. That's not the ease of installation useful, even to mount the cover without damage.