Thank you so much guys! Sorry, I didn't respond earlier. I just checked this thread.
It' s difficult to solder all parts at the same time especially on a curved surface. I usually solder together all elements in several steps. Sometimes, I use a binding wire to fix several pieces together. Yet, it doesn't work all the time. I'll try to take pictures of the whole process and post them here. Thank you again for your interest in my work.