woodsmith -
How about the following :
1 - Take off the horizontal part.
2 - Use the sides as framework for a Kamm-Back.
3 - Spend lots of time and effort making it reversible (this is optional).
Benefits :
- Kamm Back may improve range
- Reversible in case you want to return to the OEM look
Problems :
- Won't make any money selling the spoiler
- Maybe a lot of effort that won't pay off (depends on your POV)
CarloSW2