Enzo-Man.
Congrats on the Hayabusa, I got both this and the X1 at home waiting to be build. Haven't decided yet which colour schemed I will be doing my Hayabusa, leaning towards Blue/Black.
Check my thread on "Motorbike building Tips." out, some good tips there, for any others feel free to ask me or anyone else on the Board.
Not too sure where the ignition coils are on the Hayabusa, but the are often attachted to the frame behind the steering column. Not many pics out there with the fairing off.
You could easily scratchbuild one or two(more likely) and lead the 4 wires to it or simply leave them loose under the tank, doubt that the difference will really be visible.
Usually for details like this I hit the library and look for the info in the Workshop manuals.
Watch out for the masking cutouts for the Kit, they can be fun.