Been consistently doing high 50's MPG, I love this car. Definitely have to work for it though, I can't wait to see what this car will be capable of in the summer with warmer temperatures. I have an almost complete grill block on the car, but no pictures since it doesn't look like anything. It has the partial factory block, and I have some black coroplast on the backside of the grill, I'm happy with it since it's next to invisible.
I finally had some time today so I got started on my kammback. As I had said earlier, I want it to be factory appearing, so I'm going with fiberglass. I started by building a metal rod frame from 3/16" galvanized steel, and bent it to the shape I wanted. I attached it at the bottom of the rear window using the gas strut mounts through the window, and I am using the factory spoiler attachment holes at the top of the window. This allows it to be completely removable with zero modification to the car.
I was considering using the factory spoiler as a base, but decided to just go from scratch with my metal frame. To attach at the top of the window, I have two small 1/8" steel pieces, that I drilled through to match the factory spoiler mounts. I dropped some (4) bolts through my steel bar and through the factory mount, then welded the heads of the bolts to the bar. I welded the heads of the bolts because I will be fiber glassing overtop and need to stop the bolts from turning, since I will not be able to access the heads of the bolts, only tje threads will hang down. I then just built the bars/ mount into the frame. So basically I just have my own version of the factory mounting setup that uses the stock mounting points, built right into my kammback frame.
So the frame got me the shape I want, and all of my attachment points figured out. From there, I stretched fleece overtop of the wire frame, and attached and pulled it tight using paper clips. Just as it sits right now it is surprisingly rigid, so I'm sure with the resin and a few layers of fiberglass it will be quite strong.
Here is where it sits right now.
The horizontal crease isn't as bad as it seems, it appears more dramatic because it is directly under the light. Fiberglass and filler should be able to easily get rid of it.
I am going to put it back on the car tomorrow to make sure it didn't shift at all, and assuming all is still well I will put resin on the fleece cloth to make it rigid, and will add fiberglass mat, then sand, body filler, and sand it again.
I will probably paint it a simple semi-gloss black to make it match the factory spoiler that came off.
I have better pictures of the wire frame and it on the car on my phone which I will have to upload still.