Thanks for the updates and introduction! Do you mind telling us how tall you are?
There have been many cylinder-deactivation discussions here. I do not know if anyone has successfully modified an engine like that. I am sure that people just deactivate the deactivation, because who needs fuel economy?
Basjoos has front skirts. I do not know if you can make a more efficient version, but it sure could be prettier!
Aerocivic - how to drop your Cd from 0.31 to 0.17 He made a huge number of other modifications, but it does not seem like any were with sheet metal.