Aerodynamics / Aerodynamic Cost / Aero parts

Filling the spider! DIY, and smoother airflow over the crank.
You can then buy a 'normal' ring, that you'd be able to sell to a wider audience when the time came to get rid.

Given that it's not part of the chainring, does that count as a fairing?

Although the actual rule basically prohibits everything aero so we're all fucked:
"The use of recumbent machines, protective shields, windbreaks or other means of reducing air resistance is prohibited."

Other than that aspect, Fibrelyte chainrings look about 300x better.