I'm not decided yet which path to go, so I am documenting for E-AB, just in case.
If I go E-AB, the first thing I'd change is closing up the fuel windows with aluminum and putting the Moeller Marine fuel gauge in (which I will do anyway, either before or after certification).
The other thing is I don't like the avionics. I'd rather have a SkyView and the Garmin 495/496 is outdated. I really like the aera's from Garmin and I'd like to put that one in. Also I do want to have vital steam gauges as a backup for airspeed and altitude. I'd also move the location of the fuses and put resettable types in.
I already have another Rotax 912S on a different plane and I might consider putting this one in my RV-12 and swap the other one for a used 80hp, but that is just a money issue.
Basically, it really comes down to the fuel gauge and the outdated avionics and the lack of backup steam gauges for vital instruments. I'm not sure if this justifies 40 hrs of Phase 1 flying in addition to the scrutiny of an E-AB building documentation.
If there was an option for a tinted canopy, I'd buy that in a heartbeat (Southern Arizona IS BRIGHT) and then there was the problem with the window material close to the fuel spout. Plexiglas would be preferable there.
Other than that there's not really much to improve in my eyes ...