Dr. Ing. Steve,
I was hoping you would chime in. . . I think our man Peter Dawe has done something like this as well. . . hard to find photos out there.
It looks like the Boxster uses a Beru coil with a separate connector to the plug. I wonder what the distance from seated on the plug to the surface of the cover is. . . could one weld a couple studs to the aluminum cover to hold the coil? Hmmm. . . .
I cannot seem to find a good picture of the 996 valve cover design. Tony (911quest) can you help, I know you tore a boxster engine down.