Assemble parts. Best on a suitable table. Needs some space.
Insert cable. Leave some overhang so that you can shorten it when the LED strip is inserted.
Fill the longest possible path with the LED strip. Cut the rest and solder it.
Check in between that all solder joints have contact.
Hang up and enjoy
Hints
I tried to solder the cables so that they go straight down into the cable channel. Then the bending radius is smaller. I have also torn off soldered joints. Do not make the temperature on the soldering iron too hot.
In the double bindings, I have installed undercuts so that the cable has enough space. In the pentagon is a tunnel in the webs so that the cable can be fed through. With a little patience, it works.
Make the calves longer than they really need to be. Do not cut them to course. Only shorten if you also want to solder dise.