Perfection is achieved not when there is nothing left to add, but when there's nothing left to take away. -- St. Exupery
Firewall Forward
Attach the engine data plate
No rivet holes in evidence; used JB Weld
AC 45-3A just says "must be affixed to the engine at an accessible location where it is unlikely to be defaced or damaged during normal service, lost or destroyed in an accident."
Complete the baffling
Re-do or extend the right front piece -- large gap next to flywheel
Switch to a conventional breather tube
Plug the exhaust system's smoke injection port
Run a tube from the firewall to the tail, projecting past the tailwheel
Remove the nitrous oxide system
Cowl flap control(s)
Push-pull cables; separate or "Y"
Individual linear actuator motors
Calculate forces & travel required
Make sure the motors are designed for harsh environments
Adjustable position w/indicator vs. simple open/closed
Install cowl fasteners (quarter-turn)
Air intake: Removable inlet screen assembly (similar to Extras) that incorporates a 7-degree ramp and mates with the intake tube via a silicon hose coupler
Install and wire the landing light
Improve the mount; currently it's just one screw, which is bad in a heavy vibration environment like that.
Add a protective lens?
Adjust the fit; there's currently a gap around the edge of the light. Either add filler to the edges or fabricate a gasket.
Wiring must be easy to disconnect
Put an electrical connector near the firewall
Add mounting tabs for the landing light wires on the inner surface of the lower cowl, just below the cowl fasteners
Reinforce the inside of the cooling air intakes
Add fasteners to secure the upper and lower cowl halves at the front
Move the electronic ignition and auto plugs to the bottom of each cylinder?