The reason I suggested it is because I moved them back a little bit and they work just fine. I definitely wouldnt drill into or stick them on the cases either. Look at some of the photos and you'll see where I moved them to and you can decide if you like that.
Another reason not to mount more turn signals onto the case is that we dont have that quick connect for the lights like givi has them on their higher end sidecases. I dont think i'd want to keep disconnecting and reconnecting each time i take the case off.
Again, kudos. Oh FYI, i asked how hard it would be to make another one because i'm so jealous of how nicely it turned out that I had an itch to ask you to make me one. haha.
Enjoy extra storage space and the ability to still have a passenger!
EDIT: here is the thread i used to give me the idea of relocating the turn signals if you're interested in going that route.
http://www.ninjette.org/forums/showthread.php?t=26436 As always, feel free to let me know if you have any questions.