Above: that gives you a pretty good idea of how I made it.
Above: I wiped down the finish with paint thinner to clean it, then applied painter's tape. To be honest, my fingers are crossed that it won't damage the finish in the 4 or 5 months this will be on the trunk.
Gorilla tape to hold the spoiler to the painter's tape. Also wrapped around & under the side of the deck lid.
Above: from the rear, it looks much taller than it actually is, owing to the strip of tape holding the spoiler to the rear surface of the lid.
In reality it's about .5 inches taller than the Civic hybrid-style spoiler. Yes, I'm a sucker for "if a little bit is good, then..."
It's immediately obvious that airflow is changed, because the rear surface of the car gets dusty
very quickly now.
I just need this to last the winter. If I wanted a permanent spoiler, I'd get one off a Hybrid, or shape it from rigid foam insulation.