Wunderkind Turn Signal Instalation

How did you get the top cover off before the Dremel work? I've unbolted the right and left side from below but the cover doesn't pop off real easily and I don't want to pry too hard in case there's something else holding it together.
 
Same.

Prefer the curved side-plate look, BUT, yet to find a factory/clean-looking aftermarket turn signal solution that is viable with the pannier bags mounted. For now, swapped in the motoism lights in factory locations (similar to the wunderkinds).